Journal articles on the topic 'Consistent Shock-Capturing'

A theory-consistent CVAR scenario describes a set of testable regularities capturing basic assumptions of the theoretical model. Using this concept, the paper considers a standard model for exchange rate determination with forward-looking expectations and shows that all assumptions about the model’s shock structure and steady-state behavior can be formulated as testable hypotheses on common stochastic trends and cointegration. The basic stationarity assumptions of the monetary model failed to obtain empirical support. They were too restrictive to explain the observed long persistent swings in the real exchange rate, the real interest rates, and the inflation and interest rate differentials.

AbstractOne of the challenges in constructing global magnetohydrodynamic (MHD) models of the inner heliosphere for, e.g., space weather forecasting purposes, is to correctly capture the acceleration and expansion of the solar wind. In many current models, the solar wind is driven by varying the polytropic index so that a desired heating is obtained. While such schemes can yield solar wind properties consistent with observations, they are not problem-free. In this work, we demonstrate by performing MHD simulations that altering the polytropic index affects the properties of propagating shocks significantly, which in turn affect the predicted space weather conditions. Thus, driving the solar wind with such a mechanism should be used with care in simulations where correctly capturing the shock physics is essential. As a remedy, we present a simple heating function formulation by which the polytropic wind can be used while still modeling the shock physics correctly.

The ideal quantum gas dynamics as manifested by the semiclassical ellipsoidal-statistical (ES) equilibrium distribution derived in Wu et al. (Wu et al . 2012 Proc. R. Soc. A 468 , 1799–1823 ( doi:10.1098/rspa.2011.0673 )) is numerically studied for particles of three statistics. This anisotropic ES equilibrium distribution was derived using the maximum entropy principle and conserves the mass, momentum and energy, but differs from the standard Fermi–Dirac or Bose–Einstein distribution. The present numerical method combines the discrete velocity (or momentum) ordinate method in momentum space and the high-resolution shock-capturing method in physical space. A decoding procedure to obtain the necessary parameters for determining the ES distribution is also devised. Computations of two-dimensional Riemann problems are presented, and various contours of the quantities unique to this ES model are illustrated. The main flow features, such as shock waves, expansion waves and slip lines and their complex nonlinear interactions, are depicted and found to be consistent with existing calculations for a classical gas.

This paper presents an all-Mach method for two-phase inviscid flow in the presence of surface tension. A modified version of the Hartens–Lax–van Leer Contact (HLLC) solver is developed and combined for the first time with a widely used volume-of-fluid (VoF) method: the compressive interface capturing scheme for arbitrary meshes (CICSAM). This novel combination yields a scheme with both HLLC shock capturing as well as accurate liquid–gas interface tracking characteristics. It is achieved by reconstructing non-conservative (primitive) variables in a consistent manner to yield both robustness and accuracy. Liquid–gas interface curvature is computed via height functions and the convolution method. We emphasize the use of VoF in the interest of interface accuracy when modelling surface tension effects. The method is validated using a range of test-cases available in the literature. The results show flow features that are in sensible agreement with previous experimental and numerical work. In particular, the use of the HLLC-VoF combination leads to a sharp volume fraction and energy field with improved accuracy.

In this paper, a numerical study is performed in order to investigate the effect of the virtual viscosity on simulation of separated two-phase flow of gas-liquid. The governing equations solved by shock capturing method which can provide predicting the interface without the flow field solving. In this work, in order to calculate the numerical flux term, first-order centred scheme (Force scheme) was applied cause of its accuracy and appropriate validation. Analysis approves that the obtained stability range of this research is consistent with the classic Kelvin-Helmholtz instability equation only for the long wavelength with small amplitude. Results reveal that when the wavelengths are reduced, the specified range is not consistent and wavelength affects on instability range and it is over predicted. An algorithm for water faucet problem was developed in Fortran language. Short wavelength perturbations induce unbounded growth rates and make it impossible to achieve converging solutions. The approach taken in this article has been to adding virtual viscosity as a CFD technique, is used to remedy this deficiency.

AbstractSnow avalanches and other hazardous geophysical granular flows, such as debris flows, lahars and pyroclastic flows, often impact on obstacles as they flow down a slope, generating rapid changes in the flow height and velocity in their vicinity. It is important to understand how a granular material flows around such obstacles to improve the design of deflecting and catching dams, and to correctly interpret field observations. In this paper small-scale experiments and numerical simulations are used to investigate the supercritical gravity-driven free-surface flow of a granular avalanche around a circular cylinder. Our experiments show that a very sharp bow shock wave and a stagnation point are generated in front of the cylinder. The shock standoff distance is accurately reproduced by shock-capturing numerical simulations and is approximately equal to the reciprocal of the Froude number, consistent with previous approximate results for shallow-water flows. As the grains move around the cylinder the flow expands and the pressure gradients rapidly accelerate the particles up to supercritical speeds again. The internal pressure is not strong enough to immediately push the grains into the space behind the cylinder and instead a grain-free region, or granular vacuum, forms on the lee side. For moderate upstream Froude numbers and slope inclinations, the granular vacuum closes up rapidly to form a triangular region, but on steeper slopes both experiments and numerical simulations show that the pinch-off distance moves far downstream.

Computations of rarefied gas dynamical flows governed by the semiclassical Boltzmann ellipsoidal-statistical (ES) kinetic model equation using an accurate numerical method are presented. The semiclassical ES model was derived through the maximum entropy principle and conserves not only the mass, momentum and energy, but also contains additional higher order moments that differ from the standard quantum distributions. A different decoding procedure to obtain the necessary parameters for determining the ES distribution is also devised. The numerical method in phase space combines the discrete-ordinate method in momentum space and the high-resolution shock capturing method in physical space. Numerical solutions of two-dimensional Riemann problems for two configurations covering various degrees of rarefaction are presented and various contours of the quantities unique to this new model are illustrated. When the relaxation time becomes very small, the main flow features a display similar to that of ideal quantum gas dynamics, and the present solutions are found to be consistent with existing calculations for classical gas. The effect of a parameter that permits an adjustable Prandtl number in the flow is also studied.

Coagulation driven by supersonic turbulence is primarily an astrophysical problem because coagulation processes on Earth are normally associated with incompressible fluid flows at low Mach numbers, while dust aggregation in the interstellar medium for instance is an example of the opposite regime. We study coagulation of inertial particles in compressible turbulence using high-resolution direct and shock-capturing numerical simulations with a wide range of Mach numbers from nearly incompressible to moderately supersonic. The particle dynamics is simulated by representative particles and the effects on the size distribution and coagulation rate due to increasing Mach number is explored. We show that the time evolution of particle size distribution mainly depends on the compressibility (Mach number). We find that the average coagulation kernel ⟨Cij⟩ scales linearly with the average Mach number ℳrms multiplied by the combined size of the colliding particles, that is, 〈Cij〉∼〈(ai+aj)3〉 ℳrmsτη−1, which is qualitatively consistent with expectations from analytical estimates. A quantitative correction 〈Cij〉∼〈(ai+aj)3〉(vp,rms/cs)τη−1 is proposed and can serve as a benchmark for future studies. We argue that the coagulation rate ⟨Rc⟩ is also enhanced by compressibility-induced compaction of particles.

Context. In many astrophysical phenomena, and especially in those that involve the high-energy regimes that always accompany the astronomical phenomenology of black holes and neutron stars, physical conditions that are achieved are extreme in terms of speeds, temperatures, and gravitational fields. In such relativistic regimes, numerical calculations are the only tool to accurately model the dynamics of the flows and the transport of radiation in the accreting matter. Aims. We here continue our effort of modelling the behaviour of matter when it orbits or is accreted onto a generic black hole by developing a new numerical code that employs advanced techniques geared towards solving the equations of general-relativistic hydrodynamics. Methods. More specifically, the new code employs a number of high-resolution shock-capturing Riemann solvers and reconstruction algorithms, exploiting the enhanced accuracy and the reduced computational cost of adaptive mesh-refinement (AMR) techniques. In addition, the code makes use of sophisticated ray-tracing libraries that, coupled with general-relativistic radiation-transfer calculations, allow us to accurately compute the electromagnetic emissions from such accretion flows. Results. We validate the new code by presenting an extensive series of stationary accretion flows either in spherical or axial symmetry that are performed either in two or three spatial dimensions. In addition, we consider the highly nonlinear scenario of a recoiling black hole produced in the merger of a supermassive black-hole binary interacting with the surrounding circumbinary disc. In this way, we can present for the first time ray-traced images of the shocked fluid and the light curve resulting from consistent general-relativistic radiation-transport calculations from this process. Conclusions. The work presented here lays the ground for the development of a generic computational infrastructure employing AMR techniques to accurately and self-consistently calculate general-relativistic accretion flows onto compact objects. In addition to the accurate handling of the matter, we provide a self-consistent electromagnetic emission from these scenarios by solving the associated radiative-transfer problem. While magnetic fields are currently excluded from our analysis, the tools presented here can have a number of applications to study accretion flows onto black holes or neutron stars.

The mechanisms that control estuarine sediment transport are complicated due to the interaction between riverine flows, tidal currents, waves, and wave-driven currents. In the past decade, severe seabed erosion and shoreline retreat along the sandy coast of western Taiwan have raised concerns regarding the sustainability of coastal structures. In this study, ADCPs (Acoustic Doppler Current Profiler) and turbidity meters were deployed at the mouth of the Zengwen river to obtain the time series and the spatial distribution of flow velocities and turbidity during the base flow and flood conditions. A nearshore circulation model, SHORECIRC, has been adapted into a hybrid finite-difference/finite-volume, TVD (Total Variation Diminishing)-type scheme and coupled with the wave-spectrum model Simulating Waves Nearshore (SWAN). Conventional finite-difference schemes often produce unphysical oscillations when modeling coastal processes with abrupt bathymetric changes at river mouths. In contrast, the TVD-type finite volume scheme allows for robust treatment of discontinuities through the shock-capturing mechanism. The model reproduces water levels, waves, currents observed at the mouth of the Zengwen River reasonably well. The simulated residual sediment transport patterns demonstrate that the transport process at the river mouth is dominated by the interaction of the bathymetry and wave-induced currents when the riverine discharge was kept in reservoirs. The offshore residual transport causes erosion at the northern part of the river mouth, and the onshore residual transport causes accretion in the ebb tidal shoals around the center of the river mouth. The simulated morphological evolution displays significant changes on shallower deltas. The location with significant sea bed changes is consistent with the spot in which severe erosion occurred in recent years. Further analysis of morphological evolution is also discussed to identify the role of coastal structures, for example, the extension of the newly constructed groins near the river mouth.

Abstract. Plume-SPH provides the first particle-based simulation of volcanic plumes. Smoothed particle hydrodynamics (SPH) has several advantages over currently used mesh-based methods in modeling of multiphase free boundary flows like volcanic plumes. This tool will provide more accurate eruption source terms to users of volcanic ash transport and dispersion models (VATDs), greatly improving volcanic ash forecasts. The accuracy of these terms is crucial for forecasts from VATDs, and the 3-D SPH model presented here will provide better numerical accuracy. As an initial effort to exploit the feasibility and advantages of SPH in volcanic plume modeling, we adopt a relatively simple physics model (3-D dusty-gas dynamic model assuming well-mixed eruption material, dynamic equilibrium and thermodynamic equilibrium between erupted material and air that entrained into the plume, and minimal effect of winds) targeted at capturing the salient features of a volcanic plume. The documented open-source code is easily obtained and extended to incorporate other models of physics of interest to the large community of researchers investigating multiphase free boundary flows of volcanic or other origins. The Plume-SPH code (https://doi.org/10.5281/zenodo. 572819) also incorporates several newly developed techniques in SPH needed to address numerical challenges in simulating multiphase compressible turbulent flow. The code should thus be also of general interest to the much larger community of researchers using and developing SPH-based tools. In particular, the SPH−ε turbulence model is used to capture mixing at unresolved scales. Heat exchange due to turbulence is calculated by a Reynolds analogy, and a corrected SPH is used to handle tensile instability and deficiency of particle distribution near the boundaries. We also developed methodology to impose velocity inlet and pressure outlet boundary conditions, both of which are scarce in traditional implementations of SPH. The core solver of our model is parallelized with the message passing interface (MPI) obtaining good weak and strong scalability using novel techniques for data management using space-filling curves (SFCs), object creation time-based indexing and hash-table-based storage schemes. These techniques are of interest to researchers engaged in developing particles in cell-type methods. The code is first verified by 1-D shock tube tests, then by comparing velocity and concentration distribution along the central axis and on the transverse cross with experimental results of JPUE (jet or plume that is ejected from a nozzle into a uniform environment). Profiles of several integrated variables are compared with those calculated by existing 3-D plume models for an eruption with the same mass eruption rate (MER) estimated for the Mt. Pinatubo eruption of 15 June 1991. Our results are consistent with existing 3-D plume models. Analysis of the plume evolution process demonstrates that this model is able to reproduce the physics of plume development.

Abstract. Resilience is a fundamental concept for understanding vegetation as a dynamic component of the climate system. It expresses the ability of ecosystems to tolerate disturbances and to recover their initial state. Recovery times are basic parameters of the vegetation's response to forcing and, therefore, are essential for describing realistic vegetation within dynamical models. Healthy vegetation tends to rapidly recover from shock and to persist in growth and expansion. On the contrary, climatic and anthropic stress can reduce resilience thus favouring persistent decrease in vegetation activity. In order to characterize resilience, we analyzed the time series 1982–2003 of 8 km GIMMS AVHRR-NDVI maps of the Italian territory. Persistence probability of negative and positive trends was estimated according to the vegetation cover class, altitude, and climate. Generally, mean recovery times from negative trends were shorter than those estimated for positive trends, as expected for vegetation of healthy status. Some signatures of inefficient resilience were found in high-level mountainous areas and in the Mediterranean sub-tropical ones. This analysis was refined by aggregating pixels according to phenology. This multitemporal clustering synthesized information on vegetation cover, climate, and orography rather well. The consequent persistence estimations confirmed and detailed hints obtained from the previous analyses. Under the same climatic regime, different vegetation resilience levels were found. In particular, within the Mediterranean sub-tropical climate, clustering was able to identify features with different persistence levels in areas that are liable to different levels of anthropic pressure. Moreover, it was capable of enhancing reduced vegetation resilience also in the southern areas under Warm Temperate sub-continental climate. The general consistency of the obtained results showed that, with the help of suited analysis methodologies, 8 km AVHRR-NDVI data could be useful for capturing details on vegetation cover activity at local scale even in complex territories such as that of the Italian peninsula.

Abstract. Resilience is a fundamental concept for understanding vegetation as a dynamic component of the climate system. It expresses the ability of ecosystems to tolerate disturbances and to recover their initial state. Recovery times are basic parameters of the vegetation's response to forcing and, therefore, are essential for describing realistic vegetation within dynamical models. Healthy vegetation tends to rapidly recover from shock and to persist in growth and expansion. On the contrary, climatic and anthropic stress can reduce resilience thus favouring persistent decrease in vegetation activity. In order to characterize resilience, we analyzed the time series 1982–2003 of 8 km GIMMS AVHRR-NDVI maps of the Italian territory. Persistence probability of negative and positive trends was estimated according to the vegetation cover class, altitude, and climate. Generally, mean recovery times from negative trends were shorter than those estimated for positive trends, as expected for vegetation of healthy status. Some signatures of inefficient resilience were found in high-level mountainous areas and in the Mediterranean sub-tropical ones. This analysis was refined by aggregating pixels according to phenology. This multitemporal clustering synthesized information on vegetation cover, climate, and orography rather well. The consequent persistence estimations confirmed and detailed hints obtained from the previous analyses. Under the same climatic regime, different vegetation resilience levels were found. In particular, within the Mediterranean sub-tropical climate, clustering was able to identify features with different persistence levels in areas that are liable to different levels of anthropic pressure. Moreover, it was capable of enhancing reduced vegetation resilience also in the southern areas under Warm Temperate sub-continental climate. The general consistency of the obtained results showed that, with the help of suited analysis methodologies, 8 km AVHRR-NDVI data could be useful for capturing details on vegetation cover activity at local scale even in complex territories such as that of the Italian peninsula.

Abstract The influence of turbulence modeling approach by means of (U)RANS and LES on the overall modeling of turbulent condensing wet steam flows is investigated using the example of a low-pressure steam turbine cascade. For an accurate numerical treatment of turbulence in presence of shock waves, necessary for predictive scale-resolving computations, a hybrid flux treatment switches between a baseline non-dissipative central flux in energy consistent split form and a shock-capturing upwind flux in shocked regions based on a shock sensor. Condensation is realized by a mono-dispersed Euler-Euler source term model, the equation of state by the highly efficient and accurate SBTL tabulation. The numerical treatment is validated with a decay of homogeneous isotropic turbulence test case containing eddy shocklets. The measurement results of the condensing wet steam cascade are overall much better matched by LES compared to RANS and URANS. Analysis shows that the LES is much better able to account for the inherently unsteady nature of the spontaneous condensation process and its interaction with the trailing edge shock wave structure.

Recently, the energization of superthermal electrons at the Earth's bow shock was found to be consistent with a new magnetic pumping model derived in the limit where the electron transit time is much shorter than any time scale governing the evolution of the magnetic fields. The new model breaks with the common approach of integrating the kinetic equations along unperturbed orbits. Rather, the fast transit-time limit allows the electron dynamics to be characterized by adiabatic invariants (action variables) accurately capturing the nonlinear effects of electrons becoming trapped in magnetic perturbations. Without trapping, fast parallel streaming along magnetic field lines causes the electron pressure to be isotropized and homogeneous along the magnetic field lines. In contrast, trapping permits spatially varying pressure anisotropy to form along the magnetic field lines, and through a Fermi process this pressure anisotropy in turn becomes the main ingredient that renders magnetic pumping efficient for energizing superthermal electrons. We here present a detailed mathematical derivation of the model.

Introduction: Our current obsession with the lives of others “Biography—that is to say, our creative and non-fictional output devoted to recording and interpreting real lives—has enjoyed an extraordinary renaissance in recent years,” writes Nigel Hamilton in Biography: A Brief History (1). Ian Donaldson agrees that biography is back in fashion: “Once neglected within the academy and relegated to the dustier recesses of public bookstores, biography has made a notable return over recent years, emerging, somewhat surprisingly, as a new cultural phenomenon, and a new academic adventure” (23). For over a decade now, commentators having been making similar observations about our obsession with the intimacies of individual people’s lives. In a lecture in 1994, Justin Kaplan asserted the West was “a culture of biography” (qtd. in Salwak 1) and more recent research findings by John Feather and Hazel Woodbridge affirm that “the undiminished human curiosity about other peoples lives is clearly reflected in the popularity of autobiographies and biographies” (218). At least in relation to television, this assertion seems valid. In Australia, as in the USA and the UK, reality and other biographically based television shows have taken over from drama in both the numbers of shows produced and the viewers these shows attract, and these forms are also popular in Canada (see, for instance, Morreale on The Osbournes). In 2007, the program Biography celebrated its twentieth anniversary season to become one of the longest running documentary series on American television; so successful that in 1999 it was spun off into its own eponymous channel (Rak; Dempsey). Premiered in May 1996, Australian Story—which aims to utilise a “personal approach” to biographical storytelling—has won a significant viewership, critical acclaim and professional recognition (ABC). It can also be posited that the real home movies viewers submit to such programs as Australia’s Favourite Home Videos, and “chat” or “confessional” television are further reflections of a general mania for biographical detail (see Douglas), no matter how fragmented, sensationalized, or even inane and cruel. A recent example of the latter, the USA-produced The Moment of Truth, has contestants answering personal questions under polygraph examination and then again in front of an audience including close relatives and friends—the more “truthful” their answers (and often, the more humiliated and/or distressed contestants are willing to be), the more money they can win. Away from television, but offering further evidence of this interest are the growing readerships for personally oriented weblogs and networking sites such as MySpace and Facebook (Grossman), individual profiles and interviews in periodical publications, and the recently widely revived newspaper obituary column (Starck). Adult and community education organisations run short courses on researching and writing auto/biographical forms and, across Western countries, the family history/genealogy sections of many local, state, and national libraries have been upgraded to meet the increasing demand for these services. Academically, journals and e-mail discussion lists have been established on the topics of biography and autobiography, and North American, British, and Australian universities offer undergraduate and postgraduate courses in life writing. The commonly aired wisdom is that published life writing in its many text-based forms (biography, autobiography, memoir, diaries, and collections of personal letters) is enjoying unprecedented popularity. It is our purpose to examine this proposition. Methodological problems There are a number of problems involved in investigating genre popularity, growth, and decline in publishing. Firstly, it is not easy to gain access to detailed statistics, which are usually only available within the industry. Secondly, it is difficult to ascertain how publishing statistics are gathered and what they report (Eliot). There is the question of whether bestselling booklists reflect actual book sales or are manipulated marketing tools (Miller), although the move from surveys of booksellers to electronic reporting at point of sale in new publishing lists such as BookScan will hopefully obviate this problem. Thirdly, some publishing lists categorise by subject and form, some by subject only, and some do not categorise at all. This means that in any analysis of these statistics, a decision has to be made whether to use the publishing list’s system or impose a different mode. If the publishing list is taken at face value, the question arises of whether to use categorisation by form or by subject. Fourthly, there is the bedeviling issue of terminology. Traditionally, there reigned a simple dualism in the terminology applied to forms of telling the true story of an actual life: biography and autobiography. Publishing lists that categorise their books, such as BookScan, have retained it. But with postmodern recognition of the presence of the biographer in a biography and of the presence of other subjects in an autobiography, the dichotomy proves false. There is the further problem of how to categorise memoirs, diaries, and letters. In the academic arena, the term “life writing” has emerged to describe the field as a whole. Within the genre of life writing, there are, however, still recognised sub-genres. Academic definitions vary, but generally a biography is understood to be a scholarly study of a subject who is not the writer; an autobiography is the story of a entire life written by its subject; while a memoir is a segment or particular focus of that life told, again, by its own subject. These terms are, however, often used interchangeably even by significant institutions such the USA Library of Congress, which utilises the term “biography” for all. Different commentators also use differing definitions. Hamilton uses the term “biography” to include all forms of life writing. Donaldson discusses how the term has been co-opted to include biographies of place such as Peter Ackroyd’s London: The Biography (2000) and of things such as Lizzie Collingham’s Curry: A Biography (2005). This reflects, of course, a writing/publishing world in which non-fiction stories of places, creatures, and even foodstuffs are called biographies, presumably in the belief that this will make them more saleable. The situation is further complicated by the emergence of hybrid publishing forms such as, for instance, the “memoir-with-recipes” or “food memoir” (Brien, Rutherford and Williamson). Are such books to be classified as autobiography or put in the “cookery/food & drink” category? We mention in passing the further confusion caused by novels with a subtitle of The Biography such as Virginia Woolf’s Orlando. The fifth methodological problem that needs to be mentioned is the increasing globalisation of the publishing industry, which raises questions about the validity of the majority of studies available (including those cited herein) which are nationally based. Whether book sales reflect what is actually read (and by whom), raises of course another set of questions altogether. Methodology In our exploration, we were fundamentally concerned with two questions. Is life writing as popular as claimed? And, if it is, is this a new phenomenon? To answer these questions, we examined a range of available sources. We began with the non-fiction bestseller lists in Publishers Weekly (a respected American trade magazine aimed at publishers, librarians, booksellers, and literary agents that claims to be international in scope) from their inception in 1912 to the present time. We hoped that this data could provide a longitudinal perspective. The term bestseller was coined by Publishers Weekly when it began publishing its lists in 1912; although the first list of popular American books actually appeared in The Bookman (New York) in 1895, based itself on lists appearing in London’s The Bookman since 1891 (Bassett and Walter 206). The Publishers Weekly lists are the best source of longitudinal information as the currently widely cited New York Times listings did not appear till 1942, with the Wall Street Journal a late entry into the field in 1994. We then examined a number of sources of more recent statistics. We looked at the bestseller lists from the USA-based Amazon.com online bookseller; recent research on bestsellers in Britain; and lists from Nielsen BookScan Australia, which claims to tally some 85% or more of books sold in Australia, wherever they are published. In addition to the reservations expressed above, caveats must be aired in relation to these sources. While Publishers Weekly claims to be an international publication, it largely reflects the North American publishing scene and especially that of the USA. Although available internationally, Amazon.com also has its own national sites—such as Amazon.co.uk—not considered here. It also caters to a “specific computer-literate, credit-able clientele” (Gutjahr: 219) and has an unashamedly commercial focus, within which all the information generated must be considered. In our analysis of the material studied, we will use “life writing” as a genre term. When it comes to analysis of the lists, we have broken down the genre of life writing into biography and autobiography, incorporating memoir, letters, and diaries under autobiography. This is consistent with the use of the terminology in BookScan. Although we have broken down the genre in this way, it is the overall picture with regard to life writing that is our concern. It is beyond the scope of this paper to offer a detailed analysis of whether, within life writing, further distinctions should be drawn. Publishers Weekly: 1912 to 2006 1912 saw the first list of the 10 bestselling non-fiction titles in Publishers Weekly. It featured two life writing texts, being headed by an autobiography, The Promised Land by Russian Jewish immigrant Mary Antin, and concluding with Albert Bigelow Paine’s six-volume biography, Mark Twain. The Publishers Weekly lists do not categorise non-fiction titles by either form or subject, so the classifications below are our own with memoir classified as autobiography. In a decade-by-decade tally of these listings, there were 3 biographies and 20 autobiographies in the lists between 1912 and 1919; 24 biographies and 21 autobiographies in the 1920s; 13 biographies and 40 autobiographies in the 1930s; 8 biographies and 46 biographies in the 1940s; 4 biographies and 14 autobiographies in the 1950s; 11 biographies and 13 autobiographies in the 1960s; 6 biographies and 11 autobiographies in the 1970s; 3 biographies and 19 autobiographies in the 1980s; 5 biographies and 17 autobiographies in the 1990s; and 2 biographies and 7 autobiographies from 2000 up until the end of 2006. See Appendix 1 for the relevant titles and authors. Breaking down the most recent figures for 1990–2006, we find a not radically different range of figures and trends across years in the contemporary environment. The validity of looking only at the top ten books sold in any year is, of course, questionable, as are all the issues regarding sources discussed above. But one thing is certain in terms of our inquiry. There is no upwards curve obvious here. If anything, the decade break-down suggests that sales are trending downwards. This is in keeping with the findings of Michael Korda, in his history of twentieth-century bestsellers. He suggests a consistent longitudinal picture across all genres: In every decade, from 1900 to the end of the twentieth century, people have been reliably attracted to the same kind of books […] Certain kinds of popular fiction always do well, as do diet books […] self-help books, celebrity memoirs, sensationalist scientific or religious speculation, stories about pets, medical advice (particularly on the subjects of sex, longevity, and child rearing), folksy wisdom and/or humour, and the American Civil War (xvii). Amazon.com since 2000 The USA-based Amazon.com online bookselling site provides listings of its own top 50 bestsellers since 2000, although only the top 14 bestsellers are recorded for 2001. As fiction and non-fiction are not separated out on these lists and no genre categories are specified, we have again made our own decisions about what books fall into the category of life writing. Generally, we erred on the side of inclusion. (See Appendix 2.) However, when it came to books dealing with political events, we excluded books dealing with specific aspects of political practice/policy. This meant excluding books on, for instance, George Bush’s so-called ‘war on terror,’ of which there were a number of bestsellers listed. In summary, these listings reveal that of the top 364 books sold by Amazon from 2000 to 2007, 46 (or some 12.6%) were, according to our judgment, either biographical or autobiographical texts. This is not far from the 10% of the 1912 Publishers Weekly listing, although, as above, the proportion of bestsellers that can be classified as life writing varied dramatically from year to year, with no discernible pattern of peaks and troughs. This proportion tallied to 4% auto/biographies in 2000, 14% in 2001, 10% in 2002, 18% in 2003 and 2004, 4% in 2005, 14% in 2006 and 20% in 2007. This could suggest a rising trend, although it does not offer any consistent trend data to suggest sales figures may either continue to grow, or fall again, in 2008 or afterwards. Looking at the particular texts in these lists (see Appendix 2) also suggests that there is no general trend in the popularity of life writing in relation to other genres. For instance, in these listings in Amazon.com, life writing texts only rarely figure in the top 10 books sold in any year. So rarely indeed, that from 2001 there were only five in this category. In 2001, John Adams by David McCullough was the best selling book of the year; in 2003, Hillary Clinton’s autobiographical Living History was 7th; in 2004, My Life by Bill Clinton reached number 1; in 2006, Nora Ephron’s I Feel Bad About My Neck: and Other Thoughts on Being a Woman was 9th; and in 2007, Ishmael Beah’s discredited A Long Way Gone: Memoirs of a Boy Soldier came in at 8th. Apart from McCulloch’s biography of Adams, all the above are autobiographical texts, while the focus on leading political figures is notable. Britain: Feather and Woodbridge With regard to the British situation, we did not have actual lists and relied on recent analysis. John Feather and Hazel Woodbridge find considerably higher levels for life writing in Britain than above with, from 1998 to 2005, 28% of British published non-fiction comprising autobiography, while 8% of hardback and 5% of paperback non-fiction was biography (2007). Furthermore, although Feather and Woodbridge agree with commentators that life writing is currently popular, they do not agree that this is a growth state, finding the popularity of life writing “essentially unchanged” since their previous study, which covered 1979 to the early 1990s (Feather and Reid). Australia: Nielsen BookScan 2006 and 2007 In the Australian publishing industry, where producing books remains an ‘expensive, risky endeavour which is increasingly market driven’ (Galligan 36) and ‘an inherently complex activity’ (Carter and Galligan 4), the most recent Australian Bureau of Statistics figures reveal that the total numbers of books sold in Australia has remained relatively static over the past decade (130.6 million in the financial year 1995–96 and 128.8 million in 2003–04) (ABS). During this time, however, sales volumes of non-fiction publications have grown markedly, with a trend towards “non-fiction, mass market and predictable” books (Corporall 41) resulting in general non-fiction sales in 2003–2004 outselling general fiction by factors as high as ten depending on the format—hard- or paperback, and trade or mass market paperback (ABS 2005). However, while non-fiction has increased in popularity in Australia, the same does not seem to hold true for life writing. Here, in utilising data for the top 5,000 selling non-fiction books in both 2006 and 2007, we are relying on Nielsen BookScan’s categorisation of texts as either biography or autobiography. In 2006, no works of life writing made the top 10 books sold in Australia. In looking at the top 100 books sold for 2006, in some cases the subjects of these works vary markedly from those extracted from the Amazon.com listings. In Australia in 2006, life writing makes its first appearance at number 14 with convicted drug smuggler Schapelle Corby’s My Story. This is followed by another My Story at 25, this time by retired Australian army chief, Peter Cosgrove. Jonestown: The Power and Myth of Alan Jones comes in at 34 for the Australian broadcaster’s biographer Chris Masters; the biography, The Innocent Man by John Grisham at 38 and Li Cunxin’s autobiographical Mao’s Last Dancer at 45. Australian Susan Duncan’s memoir of coping with personal loss, Salvation Creek: An Unexpected Life makes 50; bestselling USA travel writer Bill Bryson’s autobiographical memoir of his childhood The Life and Times of the Thunderbolt Kid 69; Mandela: The Authorised Portrait by Rosalind Coward, 79; and Joanne Lees’s memoir of dealing with her kidnapping, the murder of her partner and the justice system in Australia’s Northern Territory, No Turning Back, 89. These books reveal a market preference for autobiographical writing, and an almost even split between Australian and overseas subjects in 2006. 2007 similarly saw no life writing in the top 10. The books in the top 100 sales reveal a downward trend, with fewer titles making this band overall. In 2007, Terri Irwin’s memoir of life with her famous husband, wildlife warrior Steve Irwin, My Steve, came in at number 26; musician Andrew Johns’s memoir of mental illness, The Two of Me, at 37; Ayaan Hirst Ali’s autobiography Infidel at 39; John Grogan’s biography/memoir, Marley and Me: Life and Love with the World’s Worst Dog, at 42; Sally Collings’s biography of the inspirational young survivor Sophie Delezio, Sophie’s Journey, at 51; and Elizabeth Gilbert’s hybrid food, self-help and travel memoir, Eat, Pray, Love: One Woman’s Search for Everything at 82. Mao’s Last Dancer, published the year before, remained in the top 100 in 2007 at 87. When moving to a consideration of the top 5,000 books sold in Australia in 2006, BookScan reveals only 62 books categorised as life writing in the top 1,000, and only 222 in the top 5,000 (with 34 titles between 1,000 and 1,999, 45 between 2,000 and 2,999, 48 between 3,000 and 3,999, and 33 between 4,000 and 5,000). 2007 shows a similar total of 235 life writing texts in the top 5,000 bestselling books (75 titles in the first 1,000, 27 between 1,000 and 1,999, 51 between 2,000 and 2,999, 39 between 3,000 and 3,999, and 43 between 4,000 and 5,000). In both years, 2006 and 2007, life writing thus not only constituted only some 4% of the bestselling 5,000 titles in Australia, it also showed only minimal change between these years and, therefore, no significant growth. Conclusions Our investigation using various instruments that claim to reflect levels of book sales reveals that Western readers’ willingness to purchase published life writing has not changed significantly over the past century. We find no evidence of either a short, or longer, term growth or boom in sales in such books. Instead, it appears that what has been widely heralded as a new golden age of life writing may well be more the result of an expanded understanding of what is included in the genre than an increased interest in it by either book readers or publishers. What recent years do appear to have seen, however, is a significantly increased interest by public commentators, critics, and academics in this genre of writing. We have also discovered that the issue of our current obsession with the lives of others tends to be discussed in academic as well as popular fora as if what applies to one sub-genre or production form applies to another: if biography is popular, then autobiography will also be, and vice versa. If reality television programming is attracting viewers, then readers will be flocking to life writing as well. Our investigation reveals that such propositions are questionable, and that there is significant research to be completed in mapping such audiences against each other. This work has also highlighted the difficulty of separating out the categories of written texts in publishing studies, firstly in terms of determining what falls within the category of life writing as distinct from other forms of non-fiction (the hybrid problem) and, secondly, in terms of separating out the categories within life writing. Although we have continued to use the terms biography and autobiography as sub-genres, we are aware that they are less useful as descriptors than they are often assumed to be. In order to obtain a more complete and accurate picture, publishing categories may need to be agreed upon, redefined and utilised across the publishing industry and within academia. This is of particular importance in the light of the suggestions (from total sales volumes) that the audiences for books are limited, and therefore the rise of one sub-genre may be directly responsible for the fall of another. Bair argues, for example, that in the 1980s and 1990s, the popularity of what she categorises as memoir had direct repercussions on the numbers of birth-to-death biographies that were commissioned, contracted, and published as “sales and marketing staffs conclude[d] that readers don’t want a full-scale life any more” (17). Finally, although we have highlighted the difficulty of using publishing statistics when there is no common understanding as to what such data is reporting, we hope this study shows that the utilisation of such material does add a depth to such enquiries, especially in interrogating the anecdotal evidence that is often quoted as data in publishing and other studies. Appendix 1 Publishers Weekly listings 1990–1999 1990 included two autobiographies, Bo Knows Bo by professional athlete Bo Jackson (with Dick Schaap) and Ronald Reagan’s An America Life: An Autobiography. In 1991, there were further examples of life writing with unimaginative titles, Me: Stories of My Life by Katherine Hepburn, Nancy Reagan: The Unauthorized Biography by Kitty Kelley, and Under Fire: An American Story by Oliver North with William Novak; as indeed there were again in 1992 with It Doesn’t Take a Hero: The Autobiography of Norman Schwarzkopf, Sam Walton: Made in America, the autobiography of the founder of Wal-Mart, Diana: Her True Story by Andrew Morton, Every Living Thing, yet another veterinary outpouring from James Herriot, and Truman by David McCullough. In 1993, radio shock-jock Howard Stern was successful with the autobiographical Private Parts, as was Betty Eadie with her detailed recounting of her alleged near-death experience, Embraced by the Light. Eadie’s book remained on the list in 1994 next to Don’t Stand too Close to a Naked Man, comedian Tim Allen’s autobiography. Flag-waving titles continue in 1995 with Colin Powell’s My American Journey, and Miss America, Howard Stern’s follow-up to Private Parts. 1996 saw two autobiographical works, basketball superstar Dennis Rodman’s Bad as I Wanna Be and figure-skater, Ekaterina Gordeeva’s (with EM Swift) My Sergei: A Love Story. In 1997, Diana: Her True Story returns to the top 10, joining Frank McCourt’s Angela’s Ashes and prolific biographer Kitty Kelly’s The Royals, while in 1998, there is only the part-autobiography, part travel-writing A Pirate Looks at Fifty, by musician Jimmy Buffet. There is no biography or autobiography included in either the 1999 or 2000 top 10 lists in Publishers Weekly, nor in that for 2005. In 2001, David McCullough’s biography John Adams and Jack Welch’s business memoir Jack: Straight from the Gut featured. In 2002, Let’s Roll! Lisa Beamer’s tribute to her husband, one of the heroes of 9/11, written with Ken Abraham, joined Rudolph Giuliani’s autobiography, Leadership. 2003 saw Hillary Clinton’s autobiography Living History and Paul Burrell’s memoir of his time as Princess Diana’s butler, A Royal Duty, on the list. In 2004, it was Bill Clinton’s turn with My Life. In 2006, we find John Grisham’s true crime (arguably a biography), The Innocent Man, at the top, Grogan’s Marley and Me at number three, and the autobiographical The Audacity of Hope by Barack Obama in fourth place. Appendix 2 Amazon.com listings since 2000 In 2000, there were only two auto/biographies in the top Amazon 50 bestsellers with Lance Armstrong’s It’s Not about the Bike: My Journey Back to Life about his battle with cancer at 20, and Dave Eggers’s self-consciously fictionalised memoir, A Heartbreaking Work of Staggering Genius at 32. In 2001, only the top 14 bestsellers were recorded. At number 1 is John Adams by David McCullough and, at 11, Jack: Straight from the Gut by USA golfer Jack Welch. In 2002, Leadership by Rudolph Giuliani was at 12; Master of the Senate: The Years of Lyndon Johnson by Robert Caro at 29; Portrait of a Killer: Jack the Ripper by Patricia Cornwell at 42; Blinded by the Right: The Conscience of an Ex-Conservative by David Brock at 48; and Louis Gerstner’s autobiographical Who Says Elephants Can’t Dance: Inside IBM’s Historic Turnaround at 50. In 2003, Living History by Hillary Clinton was 7th; Benjamin Franklin: An American Life by Walter Isaacson 14th; Dereliction of Duty: The Eyewitness Account of How President Bill Clinton Endangered America’s Long-Term National Security by Robert Patterson 20th; Under the Banner of Heaven: A Story of Violent Faith by Jon Krakauer 32nd; Leap of Faith: Memoirs of an Unexpected Life by Queen Noor of Jordan 33rd; Kate Remembered, Scott Berg’s biography of Katharine Hepburn, 37th; Who’s your Caddy?: Looping for the Great, Near Great and Reprobates of Golf by Rick Reilly 39th; The Teammates: A Portrait of a Friendship about a winning baseball team by David Halberstam 42nd; and Every Second Counts by Lance Armstrong 49th. In 2004, My Life by Bill Clinton was the best selling book of the year; American Soldier by General Tommy Franks was 16th; Kevin Phillips’s American Dynasty: Aristocracy, Fortune and the Politics of Deceit in the House of Bush 18th; Timothy Russert’s Big Russ and Me: Father and Son. Lessons of Life 20th; Tony Hendra’s Father Joe: The Man who Saved my Soul 23rd; Ron Chernow’s Alexander Hamilton 27th; Cokie Roberts’s Founding Mothers: The Women Who Raised our Nation 31st; Kitty Kelley’s The Family: The Real Story of the Bush Dynasty 42nd; and Chronicles, Volume 1 by Bob Dylan was 43rd. In 2005, auto/biographical texts were well down the list with only The Year of Magical Thinking by Joan Didion at 45 and The Glass Castle: A Memoir by Jeanette Walls at 49. In 2006, there was a resurgence of life writing with Nora Ephron’s I Feel Bad About My Neck: and Other Thoughts on Being a Woman at 9; Grisham’s The Innocent Man at 12; Bill Buford’s food memoir Heat: an Amateur’s Adventures as Kitchen Slave, Line Cook, Pasta-Maker, and Apprentice to a Dante-Quoting Butcher in Tuscany at 23; more food writing with Julia Child’s My Life in France at 29; Immaculée Ilibagiza’s Left to Tell: Discovering God amidst the Rwandan Holocaust at 30; CNN anchor Anderson Cooper’s Dispatches from the Edge: A Memoir of War, Disasters and Survival at 43; and Isabella Hatkoff’s Owen & Mzee: The True Story of a Remarkable Friendship (between a baby hippo and a giant tortoise) at 44. In 2007, Ishmael Beah’s discredited A Long Way Gone: Memoirs of a Boy Soldier came in at 8; Walter Isaacson’s Einstein: His Life and Universe 13; Ayaan Hirst Ali’s autobiography of her life in Muslim society, Infidel, 18; The Reagan Diaries 25; Jesus of Nazareth by Pope Benedict XVI 29; Mother Teresa: Come be my Light 36; Clapton: The Autobiography 40; Tina Brown’s The Diana Chronicles 45; Tony Dungy’s Quiet Strength: The Principles, Practices & Priorities of a Winning Life 47; and Daniel Tammet’s Born on a Blue Day: Inside the Extraordinary Mind of an Autistic Savant at 49. Acknowledgements A sincere thank you to Michael Webster at RMIT for assistance with access to Nielsen BookScan statistics, and to the reviewers of this article for their insightful comments. Any errors are, of course, our own. References Australian Broadcasting Commission (ABC). “About Us.” Australian Story 2008. 1 June 2008. ‹http://www.abc.net.au/austory/aboutus.htm>. 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