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Auteur : Grafiati

Publié le 11 mars 2023

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1

Auguste, Franck, Géraldine Réa, Roberto Paoli, Christine Lac, Valery Masson et Daniel Cariolle. « Implementation of an immersed boundary method in the Meso-NH v5.2 model : applications to an idealized urban environment ». Geoscientific Model Development 12, n^o 6 (1 juillet 2019) : 2607–33. http://dx.doi.org/10.5194/gmd-12-2607-2019.

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Abstract. This study describes the numerical implementation, verification and validation of an immersed boundary method (IBM) in the atmospheric solver Meso-NH for applications to urban flow modeling. The IBM represents the fluid–solid interface by means of a level-set function and models the obstacles as part of the resolved scales. The IBM is implemented by means of a three-step procedure: first, an explicit-in-time forcing is developed based on a novel ghost-cell technique that uses multiple image points instead of the classical single mirror point. The second step consists of an implicit step projection whereby the right-hand side of the Poisson equation is modified by means of a cut-cell technique to satisfy the incompressibility constraint. The condition of non-permeability is achieved at the embedded fluid–solid interface by an iterative procedure applied on the modified Poisson equation. In the final step, the turbulent fluxes and the wall model used for large-eddy simulations (LESs) are corrected, and a wall model is proposed to ensure consistency of the subgrid scales with the IBM treatment. In the second of part of the paper, the IBM is verified and validated for several analytical and benchmark test cases of flows around single bluff bodies with an increasing level of complexity. The analysis showed that the Meso-NH model (MNH) with IBM reproduces the expected physical features of the flow, which are also found in the atmosphere at much larger scales. Finally, the IBM is validated in the LES mode against the Mock Urban Setting Test (MUST) field experiment, which is characterized by strong roughness caused by the presence of a set of obstacles placed in the atmospheric boundary layer in nearly neutral stability conditions. The Meso-NH IBM–LES reproduces with reasonable accuracy both the mean flow and turbulent fluctuations observed in this idealized urban environment.

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RATHISH KUMAR, B. V., S. K. PATHAK, VIVEK SANGWAN, MOHIT NIGAM et S. K. MURTHY. « A NUMERICAL SIMULATION OF CARDIAC ELECTRIC ACTIVITY IN LV BASED ON MONO-DOMAIN MODEL ». Journal of Mechanics in Medicine and Biology 10, n^o 03 (septembre 2010) : 431–44. http://dx.doi.org/10.1142/s0219519410003538.

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Heterogeneities of ionic current expression and electrophysiological characteristics exist within the mammalian ventricle wall and are assumed to be the result of regional differences in myocardial membrane ionic current densities. This work describes computational approaches of modeling the cardiac cellular excitability and electrical activity propagation in the spatially inhomogeneous ventricular tissue. A three-dimensional (3D) unsteady Rogers model with one gating variable has been considered for simulating the cardiac electrical activity. Based on the paradigm of domain decomposition a 3D finite element scheme has been developed and implemented using PETSc Library under MPI environment. The numerical simulations are carried out on IBM SP3 machine. The computational studies provide insight into the underlying mechanisms during the normal and pathological cardiac excitation.

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Wang, Sitong, Ting Ye, Guansheng Li, Xuejiao Zhang et Huixin Shi. « Margination and adhesion dynamics of tumor cells in a real microvascular network ». PLOS Computational Biology 17, n^o 2 (19 février 2021) : e1008746. http://dx.doi.org/10.1371/journal.pcbi.1008746.

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In tumor metastasis, the margination and adhesion of tumor cells are two critical and closely related steps, which may determine the destination where the tumor cells extravasate to. We performed a direct three-dimensional simulation on the behaviors of the tumor cells in a real microvascular network, by a hybrid method of the smoothed dissipative particle dynamics and immersed boundary method (SDPD-IBM). The tumor cells are found to adhere at the microvascular bifurcations more frequently, and there is a positive correlation between the adhesion of the tumor cells and the wall-directed force from the surrounding red blood cells (RBCs). The larger the wall-directed force is, the closer the tumor cells are marginated towards the wall, and the higher the probability of adhesion behavior happen is. A relatively low or high hematocrit can help to prevent the adhesion of tumor cells, and similarly, increasing the shear rate of blood flow can serve the same purpose. These results suggest that the tumor cells may be more likely to extravasate at the microvascular bifurcations if the blood flow is slow and the hematocrit is moderate.

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Xu, Yuan, Zhonghua Huang, Shize Yang, Zhiqi Wang, Bing Yang et Yinlin Li. « Modeling and Characterization of Capacitive Coupling Intrabody Communication in an In-Vehicle Scenario ». Sensors 19, n^o 19 (4 octobre 2019) : 4305. http://dx.doi.org/10.3390/s19194305.

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Intrabody communication (IBC) has drawn extensive attention in the field of ubiquitous healthcare, entertainment, and more. Until now, most studies on the modeling and characterization of capacitive coupling IBC have been conducted in open space, while influences when using metallic-enclosed environments such as a car, airplane, or elevator have not yet been considered. In this paper, we aimed to systematically investigate the grounding effect of an enclosed metal wall of a vehicle on the transmission path loss, utilizing the finite element method (FEM) to model capacitive coupling IBC in an in-vehicle scenario. The results of a simulation and experimental validation indicated that the system gain in an in-vehicle scenario increased up to 7 dB compared to in open space. The modeling and characterization achieved in this paper of capacitive coupling IBC could facilitate an intrabody sensor design and an evaluation with great flexibility to meet the performance needs of an in-vehicle use scenario.

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Izard, Edouard, Thomas Bonometti et Laurent Lacaze. « Modelling the dynamics of a sphere approaching and bouncing on a wall in a viscous fluid ». Journal of Fluid Mechanics 747 (17 avril 2014) : 422–46. http://dx.doi.org/10.1017/jfm.2014.145.

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AbstractThe canonical configuration of a solid particle bouncing on a wall in a viscous fluid is considered here, focusing on rough particles as encountered in most of the laboratory experiments or applications. In that case, the particle deformation is not expected to be significant prior to solid contact. An immersed boundary method (IBM) allowing the fluid flow around the solid particle to be numerically described is combined with a discrete element method (DEM) in order to numerically investigate the dynamics of the system. Particular attention is paid to modelling the lubrication force added in the discrete element method, which is not captured by the fluid solver at very small scale. Specifically, the proposed numerical model accounts for the surface roughness of real particles through an effective roughness length in the contact model, and considers that the time scale of the contact is small compared to that of the fluid. The present coupled method is shown to quantitatively reproduce available experimental data and in particular is in very good agreement with recent measurement of the dynamics of a particle approaching very close to a wall in the viscous regime $St \le {O}(10)$, where $St$ is the Stokes number which represents the balance between particle inertia and viscous dissipation. Finally, based on the reliability of the numerical results, two predictive models are proposed, namely for the dynamics of the particle close to the wall and the effective coefficient of restitution. Both models use the effective roughness height and assume the particle remains rigid prior to solid contact. They are shown to be pertinent to describe experimental and numerical data for the whole range of investigated parameters.

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Adamovich, H. Y., D. B. Nizheharodava, V. K. Shadryna, A. G. Dybau, A. M. Starastsin, T. E. Vladimirskaya, A. U. Varabei et M. М. Zafranskayа. « Immunomodulatory effect of cell therapy on the experimental inflammatory bowel disease model ». Proceedings of the National Academy of Sciences of Belarus, Medical series 18, n^o 2 (4 juin 2021) : 177–85. http://dx.doi.org/10.29235/1814-6023-2021-18-2-177-185.

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Dysregulation of innate and adaptive immunity is a central mechanism in the pathogenesis of inflammatory bowel diseases (IBD) that include Crohn’s disease (CD) and ulcerative colitis (UC). Given the immunomodulatory properties of multipotent mesenchymal stromal cells (MMSCs), developing new pathogenetic approaches to the IBD treatment using cell therapy seems to be promising.In this article, the effect of intra-arterial and intravenous MMSCs on in vitro monocytes/macrophages cytokine-producing function and splenocytes proliferative activity in laboratory animals with experimental IBD under the conditions of nonspecific and specific stimulation (mannan – cell wall component of Saccharomyces cerevisiae yeast) was studied.MMSC cultures have been shown to possess an immunomodulatory effect against the background of improved clinical, morphometric parameters, and the pathomorphological picture of experimental IBD damage. Intra-arterial and intravenous administration of cell cultures decreased the mannan-induced TNF-α production by CD68+ cells and mitogen/mannan-stimulated splenocyte proliferation that confirms the immunosuppressive effect of MMSC cultures on autoreactive splenocyte clones in experimental IBD. The obtained results testify to the anti-inflammatory effect of cell therapy in the experimental modeling of IBD and justified a combined administration of MMSC cultures.

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Raghavan, R., R. J. Eickemeyer, A. C. Sawdey, J. B. Griswell, D. Parikh, S. Ramani, D. M. Daly et al. « IBM POWER8 performance and energy modeling ». IBM Journal of Research and Development 59, n^o 1 (janvier 2015) : 10:1–10:10. http://dx.doi.org/10.1147/jrd.2014.2380201.

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Liu, Xing. « Multilevel and longitudinal modeling with IBM SPSS ». International Journal of Research & ; Method in Education 34, n^o 2 (juillet 2011) : 211–13. http://dx.doi.org/10.1080/1743727x.2011.573269.

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Srinivas, M., B. Sinharoy, R. J. Eickemeyer, R. Raghavan, S. Kunkel, T. Chen, W. Maron et al. « IBM POWER7 performance modeling, verification, and evaluation ». IBM Journal of Research and Development 55, n^o 3 (mai 2011) : 4:1–4:19. http://dx.doi.org/10.1147/jrd.2011.2147170.

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Succi, S. « Cellular automata modeling on IBM 3090/VF ». Computer Physics Communications 47, n^o 2-3 (novembre 1987) : 173–80. http://dx.doi.org/10.1016/0010-4655(87)90103-2.

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Jiang, Fangyun, Xiaoping Fu, Kai Kuang et Dan Fan. « Artificial Intelligence Algorithm-Based Differential Diagnosis of Crohn’s Disease and Ulcerative Colitis by CT Image ». Computational and Mathematical Methods in Medicine 2022 (4 avril 2022) : 1–12. http://dx.doi.org/10.1155/2022/3871994.

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The aim of this study was to investigate the effect of low-dose CT enterography (CTE) based on modified guided image filtering (GIF) algorithm in the differential diagnosis of ulcerative colitis (UC) and Crohn’s disease (CD). Methods. One hundred and twenty patients with suspected diagnosis of IBD were studied. They were randomly divided into control group (routine CT examination) and observation group (low-dose CTE examination based on improved GIF algorithm), with 60 cases in each group. Comprehensive diagnosis was used as the standard to assess the diagnostic effect. Results. (1) The peak signal-to-noise ratio (PSNR) (26.02 dB) and structural similarity (SSIM) (0.8921) of the algorithm were higher than those of GIF (17.22 dB/0.8491), weighted guided image filtering (WGIF) (23.78 dB/0.8489), and gradient domain guided image filtering (GGIF) (23.77 dB/0.7567) ( P < 0.05 ); (2) the diagnostic sensitivity (91.49%), specificity (92.31%), accuracy (91.67%), positive predictive value (97.73%), and negative predictive value (75%) of the observation group were higher than those of the control group ( P < 0.05 ); the sensitivity and specificity of CTE in the diagnosis of UD and CD were 96.77% and 81.25% and 98.33% and 93.33%, respectively ( P < 0.05 ); there were significant differences in symmetrical intestinal wall thickening and smooth serosal surface between UD and CD ( P < 0.05 ). Conclusion. (1) The improved GIF algorithm has a more effective application value in the denoising processing of low-dose CT images and can better improve the image quality; (2) the accuracy of CTE in the diagnosis of IBD is high, and CTE is of great value in the differential diagnosis of UD and CD.

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Pigarov, A. Yu, et S. I. Krasheninnikov. « Coupled plasma–wall modeling ». Journal of Nuclear Materials 390-391 (juin 2009) : 192–95. http://dx.doi.org/10.1016/j.jnucmat.2009.01.165.

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Gerodimos, G., et R. M. C. So. « Near-Wall Modeling of Plane Turbulent Wall Jets ». Journal of Fluids Engineering 119, n^o 2 (1 juin 1997) : 304–13. http://dx.doi.org/10.1115/1.2819135.

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In most two-dimensional simple turbulent flows, the location of zero shear usually coincides with that of vanishing mean velocity gradient. However, such is not the case for plane turbulent wall jets. This could be due to the fact that the driving potential is the jet exit momentum, which gives rise to an outer region that resembles a free jet and an inner layer that is similar to a boundary layer. The interaction of a free-jet like flow with a boundary-layer type flow distinguishes the plane wall jet from other simple flows. Consequently, in the past, two-equation turbulence models are seldom able to predict the jet spread correctly. The present study investigates the appropriateness of two-equation modeling; particularly the importance of near-wall modeling and the validity of the equilibrium turbulence assumption. An improved near-wall model and three others are analyzed and their predictions are compared with recent measurements of plane wall jets. The jet spread is calculated correctly by the improved model, which is able to replicate the mixing behavior between the outer jet-like and inner wall layer and is asymptotically consistent. Good agreement with other measured quantities is also obtained. However, other near-wall models tested are also capable of reproducing the Reynolds-number effects of plane wall jets, but their predictions of the jet spread are incorrect.

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Wu, Y. L., C. Shu et H. Ding. « Simulation of Incompressible Viscous Flows by Local DFD-Immersed Boundary Method ». Advances in Applied Mathematics and Mechanics 4, n^o 03 (juin 2012) : 311–24. http://dx.doi.org/10.4208/aamm.10-m1171.

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AbstractA local domain-free discretization-immersed boundary method (DFD-IBM) is presented in this paper to solve incompressible Navier-Stokes equations in the primitive variable form. Like the conventional immersed boundary method (IBM), the local DFD-IBM solves the governing equations in the whole domain including exterior and interior of the immersed object. The effect of immersed boundary to the surrounding fluids is through the evaluation of velocity at interior and exterior dependent points. To be specific, the velocity at interior dependent points is computed by approximate forms of solution and the velocity at exterior dependent points is set to the wall velocity. As compared to the conventional IBM, the present approach accurately implements the non-slip boundary condition. As a result, there is no flow penetration, which is often appeared in the conventional IBM results. The present approach is validated by its application to simulate incompressible viscous flows around a circular cylinder. The obtained numerical results agree very well with the data in the literature.

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Greene, William H. « LIMDEP : An Econometric Modeling Program for the IBM PC ». American Statistician 39, n^o 3 (août 1985) : 210. http://dx.doi.org/10.2307/2683936.

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Xia, Z., P. Das, T. Huynh, A. K. Royyuru et R. Zhou. « Modeling mutations of influenza virus with IBM Blue Gene ». IBM Journal of Research and Development 55, n^o 5 (septembre 2011) : 7:1–7:11. http://dx.doi.org/10.1147/jrd.2011.2163276.

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Tafti, Danesh K., Long He et K. Nagendra. « Large eddy simulation for predicting turbulent heat transfer in gas turbines ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 372, n^o 2022 (13 août 2014) : 20130322. http://dx.doi.org/10.1098/rsta.2013.0322.

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Blade cooling technology will play a critical role in the next generation of propulsion and power generation gas turbines. Accurate prediction of blade metal temperature can avoid the use of excessive compressed bypass air and allow higher turbine inlet temperature, increasing fuel efficiency and decreasing emissions. Large eddy simulation (LES) has been established to predict heat transfer coefficients with good accuracy under various non-canonical flows, but is still limited to relatively simple geometries and low Reynolds numbers. It is envisioned that the projected increase in computational power combined with a drop in price-to-performance ratio will make system-level simulations using LES in complex blade geometries at engine conditions accessible to the design process in the coming one to two decades. In making this possible, two key challenges are addressed in this paper: working with complex intricate blade geometries and simulating high-Reynolds-number ( Re ) flows. It is proposed to use the immersed boundary method (IBM) combined with LES wall functions. A ribbed duct at Re =20 000 is simulated using the IBM, and a two-pass ribbed duct is simulated at Re =100 000 with and without rotation (rotation number Ro =0.2) using LES with wall functions. The results validate that the IBM is a viable alternative to body-conforming grids and that LES with wall functions reproduces experimental results at a much lower computational cost.

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Kanchan, Mithun, et Ranjith Maniyeri. « Numerical Simulation of Flow in a Wavy Wall Microchannel Using Immersed Boundary Method ». Recent Patents on Mechanical Engineering 13, n^o 2 (31 mai 2020) : 118–25. http://dx.doi.org/10.2174/2212797613666200207111629.

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Background: Fluid flow in microchannels is restricted to low Reynolds number regimes and hence inducing chaotic mixing in such devices is a major challenge. Over the years, the Immersed Boundary Method (IBM) has proved its ability in handling complex fluid-structure interaction problems. Objectives: Inspired by recent patents in microchannel mixing devices, we study passive mixing effects by performing two-dimensional numerical simulations of wavy wall in channel flow using IBM. Methods: The continuity and Navier-Stokes equations governing the flow are solved by fractional step based finite volume method on a staggered Cartesian grid system. Fluid variables are described by Eulerian coordinates and solid boundary by Lagrangian coordinates. A four-point Dirac delta function is used to couple both the coordinate variables. A momentum forcing term is added to the governing equation in order to impose the no-slip boundary condition between the wavy wall and fluid interface. Results: Parametric study is carried out to analyze the fluid flow characteristics by varying amplitude and wavelength of wavy wall configurations for different Reynolds number. Conclusion: Configurations of wavy wall microchannels having a higher amplitude and lower wavelengths show optimum results for mixing applications.

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Azab, Karam Anwar, et John B. McLaughlin. « Modeling the viscous wall region ». Physics of Fluids 30, n^o 8 (1987) : 2362. http://dx.doi.org/10.1063/1.866126.

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Subba, F., et R. Zanino. « Modeling plasma-wall interactions in First Wall-Limiter geometry ». Computer Physics Communications 164, n^o 1-3 (décembre 2004) : 377–82. http://dx.doi.org/10.1016/j.cpc.2004.06.050.

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Sayed-Ahmed, Ezzeldin Y., et Nigel G. Shrive. « Numerical analysis of face-shell bedded hollow masonry walls subject to concentrated loads ». Canadian Journal of Civil Engineering 22, n^o 4 (1 août 1995) : 802–18. http://dx.doi.org/10.1139/l95-090.

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A nonlinear elastoplastic finite element model has been developed for face-shell bedded hollow masonry walls subject to in-plane concentrated loads. The model takes into account geometric and material nonlinearities as well as damage due to progressive cracking. Behaviour of the masonry components subject to compressive states of stress is modelled using the theory of plasticity, and cracking is modelled using both discrete and smeared cracking approaches. The model is generated on a SUN SPARC 10/31 workstation using the preprocessor of the finite element program ANSYS; the finite element solution is obtained using the ABAQUS program on the Fujitsu VPX 240/10 and IBM RS/6000 workstation. A brief summary of the numerical modelling and the iterative procedures is discussed. Results from simulated tests of seven-course high wallettes subject to concentrated loads are used to verify the behaviour of the numerical analyses. The methodology, when combined with substructuring, allows analysis of substantially larger walls than would more typical 3-D analyses. The model can be used to check existing design rules and develop more rational design methods for hollow masonry subject to concentrated load. Key words: masonry, hollow concrete masonry, finite element modelling, cracking, failure, strength enhancement factor, concentrated loads.

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Buksman, E., A. L. Fonseca de Oliveira et C. Allende. « Performance and error modeling of Deutsch's algorithm in IBM Q ». Revista Mexicana de Física 66, n^o 2 Mar-Apr (1 mars 2020) : 239. http://dx.doi.org/10.31349/revmexfis.66.239.

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The performance of quantum computers today can be studied by analyzing theeect of errors in the result of simple quantum algorithms. The modeling and char-acterization of these errors is relevant to correct them, for example, with quantumcorrecting codes. In this article we characterize the error of the ve qubits quantumcomputer ibmqx4 (IBM Q), using a Deutsch algorithm and modeling the error byGeneralized Amplitude Damping (GAD) and a unitary misalignment operation.

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Broome, John. « An IBM-compatible program for interactive three-dimensional gravity modeling ». Computers & ; Geosciences 18, n^o 2-3 (mars 1992) : 337–48. http://dx.doi.org/10.1016/0098-3004(92)90084-5.

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Schmitt, Volker H., Christine Schmitt, David Hollemann, Andreas Mamilos, Willi Wagner, Oliver Weinheimer et Christoph Brochhausen. « Comparison of histological and computed tomographic measurements of pig lung bronchi ». ERJ Open Research 6, n^o 4 (24 septembre 2020) : 00500–2020. http://dx.doi.org/10.1183/23120541.00500-2020.

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AimLight microscopy is used as template in the evaluation and further development of medical imaging methods. Tissue shrinkage caused by histological processing is known to influence lung tissue dimensions. In diagnosis of COPD, computed tomography (CT) is widely used for automated airway measurement. The aim of this study was to compare histological and computed tomographic measurements of pig lung bronchi.MethodsAirway measurements of pig lungs were performed after freezing under controlled inflation pressure in a liquid nitrogen bath. The wall thickness of seven bronchi was measured via Micro-CT and CT using the integral-based method (IBM) and the full-width-at-half-maximum method (FWHM) automatically and histologically on frozen and paraffin sections. Statistical analysis was performed using the Wilcoxon test, Pearson's correlation coefficient with a significance level at p<0.05, scatter plots and Bland–Altman plots.ResultsBronchial wall thickness was smallest in frozen sections (median 0.71 mm) followed by paraffin sections (median 0.75 mm), Micro-CT (median 0.84 mm), and CT measurements using IBM (median 0.68 mm) and FWHM (median 1.69 mm). Statistically significant differences were found among all tested groups (p<0.05) except for CT IBM and paraffin and frozen sections and Micro-CT. There was high correlation between all parameters with statistical significance (p<0.05).ConclusionsSignificant differences in airway measurement were found among the different methods. The absolute measurements with CT IBM were closest to the histological results followed by Micro-CT, whereas CT FWHM demonstrated a distinct divergence from the other groups.

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Ferrier, Rachel, Bernard Hezard, Adrienne Lintz, Valérie Stahl et Jean-Christophe Augustin. « Combining Individual-Based Modeling and Food Microenvironment Descriptions To Predict the Growth of Listeria monocytogenes on Smear Soft Cheese ». Applied and Environmental Microbiology 79, n^o 19 (19 juillet 2013) : 5870–81. http://dx.doi.org/10.1128/aem.01311-13.

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ABSTRACTAn individual-based modeling (IBM) approach was developed to describe the behavior of a fewListeria monocytogenescells contaminating smear soft cheese surface. The IBM approach consisted of assessing the stochastic individual behaviors of cells on cheese surfaces and knowing the characteristics of their surrounding microenvironments. We used a microelectrode for pH measurements and micro-osmolality to assess the water activity of cheese microsamples. These measurements revealed a high variability of microscale pH compared to that of macroscale pH. A model describing the increase in pH from approximately 5.0 to more than 7.0 during ripening was developed. The spatial variability of the cheese surface characterized by an increasing pH with radius and higher pH on crests compared to that of hollows on cheese rind was also modeled. The microscale water activity ranged from approximately 0.96 to 0.98 and was stable during ripening. The spatial variability on cheese surfaces was low compared to between-cheese variability. Models describing the microscale variability of cheese characteristics were combined with the IBM approach to simulate the stochastic growth ofL. monocytogeneson cheese, and these simulations were compared to bacterial counts obtained from irradiated cheeses artificially contaminated at different ripening stages. The simulated variability ofL. monocytogenescounts with the IBM/microenvironmental approach was consistent with the observed one. Contrasting situations corresponding to no growth or highly contaminated foods could be deduced from these models. Moreover, the IBM approach was more effective than the traditional population/macroenvironmental approach to describe the actual bacterial behavior variability.

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Mizuno, Yusuke, Shun Takahashi, Kota Fukuda et Shigeru Obayashi. « Direct Numerical Simulation of Gas–Particle Flows with Particle–Wall Collisions Using the Immersed Boundary Method ». Applied Sciences 8, n^o 12 (26 novembre 2018) : 2387. http://dx.doi.org/10.3390/app8122387.

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We investigated particulate flows by coupling simulations of the three-dimensional incompressible Navier–Stokes equation with the immersed boundary method (IBM). The results obtained from the two-way coupled simulation were compared with those of the one-way simulation, which is generally applied for clarifying the particle kinematics in industry. In the present flow simulation, the IBM was solved using a ghost–cell approach and the particles and walls were defined by a level set function. Using proposed algorithms, particle–particle and particle–wall collisions were implemented simply; the subsequent coupling simulations were conducted stably. Additionally, the wake structures of the moving, colliding and rebounding particles were comprehensively compared with previous numerical and experimental results. In simulations of 50, 100, 200 and 500 particles, particle–wall collisions were more frequent in the one–way scheme than in the two-way scheme. This difference was linked to differences in losses in energy and momentum.

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MATSUMOTO, Koki, et Atsutaka TAMURA. « Computational modeling of aortic medial wall : ». Proceedings of Conference of Chugoku-Shikoku Branch 2021.59 (2021) : 01b2. http://dx.doi.org/10.1299/jsmecs.2021.59.01b2.

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Mansour, N. N., J. Kim et P. Moin. « Near-wall k-epsilon turbulence modeling ». AIAA Journal 27, n^o 8 (août 1989) : 1068–73. http://dx.doi.org/10.2514/3.10222.

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Gizzi, Alessio, Anna Pandolfi et Marcello Vasta. « Viscoelectromechanics modeling of intestine wall hyperelasticity ». International Journal for Computational Methods in Engineering Science and Mechanics 17, n^o 3 (3 mai 2016) : 143–55. http://dx.doi.org/10.1080/15502287.2015.1082678.

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Gavaises, M., A. Theodorakakos et G. Bergeles. « Modeling wall impaction of diesel sprays ». International Journal of Heat and Fluid Flow 17, n^o 2 (avril 1996) : 130–38. http://dx.doi.org/10.1016/0142-727x(95)00097-a.

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Scales, N., et R. N. Tait. « Modeling wall effects in capillary electrochromatography ». Journal of Chromatography A 1205, n^o 1-2 (septembre 2008) : 150–57. http://dx.doi.org/10.1016/j.chroma.2008.08.002.

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Kuhl, E., R. Maas, G. Himpel et A. Menzel. « Computational modeling of arterial wall growth ». Biomechanics and Modeling in Mechanobiology 6, n^o 5 (22 novembre 2006) : 321–31. http://dx.doi.org/10.1007/s10237-006-0062-x.

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Zhiwei Xu et K. Hwang. « Modeling communication overhead : MPI and MPL performance on the IBM SP2 ». IEEE Parallel & ; Distributed Technology : Systems & ; Applications 4, n^o 1 (1996) : 9–24. http://dx.doi.org/10.1109/88.481662.

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Du Preez, Rose, et Michael Thomas Bendixen. « The impact of internal brand management on employee job satisfaction, brand commitment and intention to stay ». International Journal of Bank Marketing 33, n^o 1 (2 février 2015) : 78–91. http://dx.doi.org/10.1108/ijbm-02-2014-0031.

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Purpose – The purpose of this paper is to examine the extent to which internal brand management (IBM), a subset of internal marketing, impacts on the three dimensions of job satisfaction ( JS), brand commitment (BC) and intention to stay (IS). Design/methodology/approach – A financial services company in Southern Africa was selected using convenience sampling. Exploratory factor analysis (EFA) was used to identify the dimensions of IBM, BC, JS and IS. Partial least squares path modeling was used to test the model and the hypotheses. The Mann-Whitney test was used to identify any statistically significant differences between frontline staff and management/support staff. Findings – The EFA of the components of IBM did not yield the three expected dimensions. For service staff, IBM significantly contributes to JS, BC and IS. Internal brand communication is the most important contributor to IBM. Research limitations/implications – In common with others, this research uses a limited sample size in a specific geographic location. The results may differ if replicated in other geographies or organizations. Practical implications – Executives and managers of financial service firms are advised to drive focussed IBM practices rather than waiting for it to become the passive consequence of human resource management. Originality/value – Given the paucity of research into the practical application of IBM, the purpose of this research is to explore the impact of IBM on frontline employees in the financial services industry.

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Pandurang, Kumbhar Pankaj, et A. P. Khatri. « BIM, Lack of Importance for Construction Projects in India ». International Journal for Research in Applied Science and Engineering Technology 10, n^o 5 (31 mai 2022) : 950–54. http://dx.doi.org/10.22214/ijraset.2022.42298.

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Abstract: Many researchers have endorsed Building Information Modeling (BIM) as the greatest technology for improving construction procedures. Most construction companies, on the other hand, do not employ BIM due to a number of barriers. The purpose of this article is to look into the barriers to BIM adoption in the construction industry. A quantitative technique was used to study the research objectives, and a structured questionnaire was created. The questionnaire was distributed Through the medium of Link, with 53 of them being satisfactorily completed. Whereas analysis was been carried out on software IBM SPSS Statistics Version 26. Keywords: Construction industry, Building Information Modeling (BIM), Limitation considerations Quantitative method, Structured \questionnaire, IBM SPSS Statistics.

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KERBYSON, DARREN J., et KEVIN J. BARKER. « MODELING THE PERFORMANCE OF DIRECT NUMERICAL SIMULATION ON PARALLEL SYSTEMS ». Parallel Processing Letters 21, n^o 03 (septembre 2011) : 301–18. http://dx.doi.org/10.1142/s0129626411000230.

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Direct Numerical Simulation (DNS) is an important application area that is expected to use large fractions of future large-scale simulations. In this work we develop, validate and use a performance model of the combustion code, DNS3D, to explore achieved performance on current parallel systems. The performance model is developed from a thorough analysis of the application. Its key computation characteristics are coupled with the performance characteristics of the system using an parameterized analytical model. The model is validated on three parallel systems: a muti-core AMD Opteron based system with an Infiniband fat-tree network, an IBM Power5+ system with an HPS fat-tree network, and an IBM Power7 system with a direct connect network. The performance model is shown to achieve high prediction accuracy on all three systems. We illustrate how the model can be used to explore impact of changes in either the system or the application. It is used to both analyze the achieved performance on these systems as well as to explore the possible benefits of further optimizing DNS3D's main computational kernel of one-dimensional FFTs, or in possibly overlapping communication with computation.

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H J, Srujan. « Dynamic Price Prediction using IBM Watson Studio ». International Journal for Research in Applied Science and Engineering Technology 10, n^o 7 (31 juillet 2022) : 3015–19. http://dx.doi.org/10.22214/ijraset.2022.45682.

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Abstract: Many companies like Ola, Uber, etc., uses Artificial Intelligence and machine learning technologies to find the solution of accurate fare prediction problem. We are using random forest regression algorithm, which is useful for prediction modeling to get the most accurate value. The project will be helpful to those, who are involved in fare forecasting. In previous era, the fare was only dependent on distance, but with the enhancement in technologies the cab’s fare is dependent on a lot of factors like time, location, number of passengers, traffic, number of hours, base fare etc. The project is based on Supervised Learning whose one application is prediction, in machine learning. The project aims to study the predictive analysis, which is a method of analysis in machine learning

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Manning, Nathan F., Jonathan M. Bossenbroek, Christine M. Mayer, David B. Bunnell, Jeff T. Tyson, Lars G. Rudstam et James R. Jackson. « Modeling turbidity type and intensity effects on the growth and starvation mortality of age-0 yellow perch ». Canadian Journal of Fisheries and Aquatic Sciences 71, n^o 10 (octobre 2014) : 1544–53. http://dx.doi.org/10.1139/cjfas-2013-0528.

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We sought to quantify the possible population-level influence of sediment plumes and algal blooms on yellow perch (Perca flavescens), a visual predator found in systems with dynamic water clarity. We used an individual-based model (IBM), which allowed us to include variance in water clarity and the distribution of individual sizes. Our IBM was built with laboratory data showing that larval yellow perch feeding rates increased slightly as sediment turbidity level increased, but that both larval and juvenile yellow perch feeding rates decreased as phytoplankton level increased. Our IBM explained a majority of the variance in yellow perch length in data from the western and central basins of Lake Erie and Oneida Lake, with R2 values ranging from 0.611 to 0.742. Starvation mortality was size dependent, as the greatest daily mortality rates in each simulation occurred within days of each other. Our model showed that turbidity-dependent consumption rates and temperature are key components in determining growth and starvation mortality of age-0 yellow perch, linking fish production to land-based processes that influence water clarity. These results suggest the timing and persistence of sediment plumes and algal blooms can drastically alter the growth potential and starvation mortality of a yellow perch cohort.

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Pavlov, P. A., et S. M. Mitrofanov. « Modeling of Near-Wall Explosive Boiling-up ». Heat Transfer Research 38, n^o 7 (2007) : 635–46. http://dx.doi.org/10.1615/heattransres.v38.i7.60.

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Hasemi, Y. « Thermal Modeling Of Upward Wall Flame Spread ». Fire Safety Science 1 (1986) : 87–96. http://dx.doi.org/10.3801/iafss.fss.1-87.

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Abdellah, Amr G., Salah E. El-Metwaly et Ahmed M. Yousef. « Orthotropic homogenized modeling of masonry wall panels ». Journal of Structural Engineering & ; Applied Mechanics 3, n^o 3 (30 septembre 2020) : 153–68. http://dx.doi.org/10.31462/jseam.2020.03153168.

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Brescianini, C. P., et R. G. Morgan. « Numerical modeling of wall-injected scramjet experiments ». Journal of Propulsion and Power 9, n^o 2 (mars 1993) : 169–75. http://dx.doi.org/10.2514/3.23605.

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Jaw, S. Y., et C. J. Chen. « Near-Wall Turbulence Modeling Using Fractal Dimensions ». Journal of Engineering Mechanics 125, n^o 7 (juillet 1999) : 804–11. http://dx.doi.org/10.1061/(asce)0733-9399(1999)125:7(804).

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Shih, T.-H., et J. L. Lumley. « Second-order modeling of near-wall turbulence ». Physics of Fluids 29, n^o 4 (1986) : 971. http://dx.doi.org/10.1063/1.865692.

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JIN, Zhao-Fen, Yutaka ASAKO, Yoshiyuki YAMAGUCHI et Minoru HARADA. « Study on Numerical Modeling of Fire Wall. » Transactions of the Japan Society of Mechanical Engineers Series B 63, n^o 609 (1997) : 1747–53. http://dx.doi.org/10.1299/kikaib.63.1747.

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Durbin, P. A. « On modeling three‐dimensional turbulent wall layers ». Physics of Fluids A : Fluid Dynamics 5, n^o 5 (mai 1993) : 1231–38. http://dx.doi.org/10.1063/1.858889.

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Epackachi, Siamak, Andrew S. Whittaker et Yin Nan Huang. « Analytical modeling of rectangular SC wall panels ». Journal of Constructional Steel Research 105 (février 2015) : 49–59. http://dx.doi.org/10.1016/j.jcsr.2014.10.016.

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Lai, Y. G., et R. M. C. So. « Near-wall modeling of turbulent heat fluxes ». International Journal of Heat and Mass Transfer 33, n^o 7 (juillet 1990) : 1429–40. http://dx.doi.org/10.1016/0017-9310(90)90040-2.

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Brooks, Caleb S., et Takashi Hibiki. « Wall nucleation modeling in subcooled boiling flow ». International Journal of Heat and Mass Transfer 86 (juillet 2015) : 183–96. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.03.005.

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Grm, Aleksander, Tomaž Šuštar, Tomaž Rodič et Franci Gabrovšek. « A Numerical Framework for Wall Dissolution Modeling ». Mathematical Geosciences 49, n^o 5 (6 juillet 2016) : 657–75. http://dx.doi.org/10.1007/s11004-016-9641-2.

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