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Artykuły w czasopismach na temat "ALE-Lagrangian approach"
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Zreid, Imadeddin, Ronny Behnke i Michael Kaliske. "ALE formulation for thermomechanical inelastic material models applied to tire forming and curing simulations". Computational Mechanics 67, nr 6 (24.04.2021): 1543–57. http://dx.doi.org/10.1007/s00466-021-02005-5.
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AbstractForming of tires during production is a challenging process for Lagrangian solid mechanics due to large changes in the geometry and material properties of the rubber layers. This paper extends the Arbitrary Lagrangian–Eulerian (ALE) formulation to thermomechanical inelastic material models with special consideration of rubber. The ALE approach based on tracking the material and spatial meshes is used, and an operator-split is employed which splits up the solution within a time step into a mesh smoothing step, a history remapping step and a Lagrangian step. Mesh distortion is reduced in the smoothing step by solving a boundary value problem. History variables are subsequently remapped to the new mesh with a particle tracking scheme. Within the Lagrangian steps, a fully coupled thermomechanical problem is solved. An advanced two-phase rubber model is incorporated into the ALE approach, which can describe green rubber, cured rubber and the transition process. Several numerical examples demonstrate the superior behavior of the developed formulation in comparison to purely Lagrangian finite elements.
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Minh Thanh, Vu, Sigit P. Santosa, Djarot Widagdo i Ichsan Setya Putra. "Steel Plate Behavior under Blast Loading-Numerical Approach Using LS-DYNA". Applied Mechanics and Materials 842 (czerwiec 2016): 200–207. http://dx.doi.org/10.4028/www.scientific.net/amm.842.200.
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Plate is one of the most common structural elements, which appears in a wide range of applications: steel bridges, blast-resistance door, and armored vehicles. In this paper, the behavior of steel plates under blast loading was studied through numerical approaches using LS DYNA and then the results were compared with the experiment results obtained from existing literatures. The study of a clamped square plate exposed to blast loading in three distinct stand-off distances. Three different methods of modeling blast loading were used, namely: empirical blast method, arbitrary Lagrangian Eulerian (ALE) method, and coupling of Lagrangian and Eulerian method. The empirical blast method was deployed by using key card *LOAD_BLAST in LS-DYNA. In ALE method, Langrangian and Eulerian solution were combined in the same model and the fluid-structure interaction (FSI) handled by coupling algorithm. In coupling method, the engineering load blast in LS-DYNA (*LOAD_BLAST_ENHANCED) was coupled with the ALE solver. In terms of central deflection and computational time, the coupling method appeared to be the best method which is very time-effective and showed a good correlation with the experiment data.
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ASGARI, ALIASGHAR, i ALI NAYEBI. "IMPLEMENTATION OF THE EULERIAN AND THE ARBITRARY LAGRANGIAN–EULERIAN DESCRIPTIONS IN FINITE ELEMENT SIMULATION OF EXTRUSION PROCESSES". International Journal of Computational Materials Science and Engineering 02, nr 03n04 (grudzień 2013): 1350013. http://dx.doi.org/10.1142/s2047684113500139.
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In this paper, backward and forward–backward-radial extrusion processes of aluminum have been simulated using finite element method. Due to the extreme deformation of the workpiece and the restrictions of the Lagrangian approach to simulate such problems, the arbitrary Lagrangian–Eulerian (ALE) and the Eulerian descriptions have been implemented in backward and forward–backward-radial extrusion processes, respectively. Operator-split method is used to solve the coupled governing equations of the Eulerian and the ALE formulations. To validate the finite element simulations, the results have been compared with experimental data in terms of extrusion load and geometry of final products. A good agreement has been seen between the results demonstrating the capability of the Eulerian and the ALE methods on finite element simulation of extrusion processes.
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Joyot, P., R. Rakotomalala, O. Pantalé, M. Touratier i N. Hakem. "A numerical simulation of steady state metal cutting". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 212, nr 5 (1.05.1998): 331–41. http://dx.doi.org/10.1243/0954406981521268.
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An arbitrary Lagrangian-Eulerian (ALE) approach is used to model the orthogonal metal cutting in a steady state situation. The thermomechanical model includes the effects of elasticity, plasticity, strain rate, large strains and friction with heat generated between the tool and the chip. The ALE formulation can combine the advantages of both the Eulerian and Lagrangian approaches in a single description. Particularly, problems linked to the free surface in a Eulerian description and those linked to severe mesh distortions in a Lagrangian one can be solved by this formulation. The ALE governing equations are briefly reviewed in this paper; finite element and finite volume methods are used for the discretization of the conservation equations and an explicit time integration is adopted. Only the steady state solution is required; the ALE formulation is exploited to update the free and the contact surfaces. The model predicts the thermomechanical quantities, the chip geometry and the cutting forces from the cutting data and the material and friction parameters. Cutting experiments were performed with 42CD4 steel and comparisons of experimental tool forces and chip geometry with the numerical results are presented.
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Sridhar, Praveen, Juan Rodríguez Prieto i Kristin de Payrebrune. "Modeling Grinding Processes—Mesh or Mesh-Free Methods, 2D or 3D Approach?" Journal of Manufacturing and Materials Processing 6, nr 5 (13.10.2022): 120. http://dx.doi.org/10.3390/jmmp6050120.
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The objectives of this study are mainly two: (1) to validate whether a single grain scratch process can be modeled in two dimensions under the assumption of plane strain, and (2) to select the best discretization approach to model a single grain scratch process. This paper first focuses on the simulation of the orthogonal cutting process (aluminum alloy A2024 T351) using two mesh-based discretization approaches, the pure Lagrangian method (LAG) and the arbitrary Lagrangian–Eulerian method (ALE), and two particle-based approaches, the particle finite element method (PFEM) and smooth particle hydrodynamics (SPH), for both positive and negative rake angles. Benchmarking of the orthogonal cutting models at a rake angle of γ=20∘ is performed with the results of the process forces (cutting and passive forces) of a turning experiment from the literature. It is shown that all models are able to predict the cutting forces, but not the passive force. The orthogonal cutting model is further extended to simulate the cutting mechanism with negative rake tool geometries typically found in grinding and single grit scratching processes. The effects of the negative rake angles on the discretization approaches are studied. The calculated process forces are also compared to the measurements of the single grit scratch process performed at our laboratory. The 2D orthogonal cutting models significantly overestimate the process forces. One of the reasons why the orthogonal 2D cutting model is inadequate is that it cannot describe the complex mechanisms of material removal such as rubbing, plowing, and cutting. To account for these phenomena in LAG, ALE, and SPH discretization approaches, a 3D scratch model is developed. When comparing the process forces of the 3D model with the experimental measurements, all three discretization approaches show good agreement. However, it can be seen that the ALE model most closely matches the process forces with the experimental results. Finally, the ALE 3D scratch model was subjected to sensitivity analysis by changing the cutting speed, the depth of cut and the tool geometry. The results clearly show that the ALE method not only predicts the process forces and form the trends observed in the scratching experiments, but also predicts the scratch topography satisfactorily. Hence, we conclude that a 3D model is necessary to describe a scratch process and that the ALE method is the best discretization method.
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WANG, Y. J., N. ZHAO, C. W. WANG i D. H. WANG. "A SECOND-ORDER ADAPTIVE ARBITRARY LAGRANGIAN–EULERIAN METHOD FOR THE COMPRESSIBLE EULER EQUATIONS". Modern Physics Letters B 23, nr 04 (10.02.2009): 583–601. http://dx.doi.org/10.1142/s0217984909017923.
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Most of finite volume schemes in the Arbitrary Lagrangian–Eulerian (ALE) method are constructed on the staggered mesh, where the momentum is defined at the nodes and the other variables (density, pressure and specific internal energy) are cell-centered. However, this kind of schemes must use a cell-centered remapping algorithm twice which is very inefficient. Furthermore, there is inconsistent treatment of the kinetic and internal energies.1 Recently, a new class of cell-centered Lagrangian scheme for two-dimensional compressible flow problems has been proposed in Ref. 2. The main new feature of the algorithm is the introduction of four pressures on each edge, two for each node on each side of the edge. This scheme is only first-order accurate. In this paper, a second-order cell-centered conservative ENO Lagrangian scheme is constructed by using an ENO-type approach to extend the spatial second-order accuracy. Time discretization is based on a second-order Runge–Kutta scheme. Combining a conservative interpolation (remapping) method3,4 with the second-order Lagrangian scheme, a kind of cell-centered second-order ALE methods can be obtained. Some numerical experiments are made with this method. All results show that our method is effective and have second-order accuracy. At last, in order to further increase the resolution of shock regions, we use an adaptive mesh generation based on the variational principle5 as a rezoned strategy for developing a class of adaptive ALE methods. Numerical experiments are also presented to valid the performance of the proposed method.
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Boman, Romain, i Jean Philippe Ponthot. "Continuous Roll Forming Simulation Using Arbitrary Lagrangian Eulerian Formalism". Key Engineering Materials 473 (marzec 2011): 564–71. http://dx.doi.org/10.4028/www.scientific.net/kem.473.564.
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Due to the length of the mill, accurate modelling of stationary solution of continuous cold roll forming by the finite element method using the classical Lagrangian formulation usually requires a very large mesh leading to huge CPU times. In order to model industrial forming lines including many tools in a reasonable time, the sheet has to be shortened or the element size has to be increased leading to inaccurate results. On top of this, applying loads and boundary conditions on this smaller sheet is usually more difficult than in the continuous case. Moreover, transient dynamic vibrations, which are unnecessarily computed, may appear when the sheet hits each tool, decreasing the convergence rate of the numerical simulation. Beside this classical Lagrangian approach, an alternative method is given by the Arbitrary Lagrangian Eulerian (ALE) formalism which consists in decoupling the motion of the material and the mesh. Starting from an initial guess of the sheet geometry between the rolls, the numerical simulation is performed until the stationary state is reached with a mesh, the nodes of which are fixed in the rolling direction but are free to move on perpendicular plane, following the geometrical boundary of the sheet. The whole forming line can then be modelled using a limited number of brick and contact elements because the mesh is only refined near the tools where bending and contact occur. In this paper, ALE results are compared to previous Lagrangian simulations and experimental measurement on a U-channel, including springback. Advantages of the ALE method are finally demonstrated by the simulation of a tubular rocker panel on a 16-stands forming mill.
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Ziefle, M., i U. Nackenhorst. "An Internal Variable Update Procedure for the Treatment of Inelastic Material Behavior within an ALE-Description of Rolling Contact". Applied Mechanics and Materials 9 (październik 2007): 157–71. http://dx.doi.org/10.4028/www.scientific.net/amm.9.157.
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Arbitrary Lagrangian Eulerian (ALE) methods provide a well established basis for the numerical analysis of rolling contact problems, the theoretical framework is well developed for elastic constitutive behavior. Special measures are necessary for the treatment of history dependent and explicitly time dependent material behavior within the relative–kinematic ALE– picture. In this presentation a fractional step approach is suggested for the integration of the evolution equation for internal variables. A Time–Discontinuous Galerkin (TDG) method is introduced for the numerical solution of the related advection equations. The advantage of TDG–methods in comparison with more traditional integration schemes is studied in detail. The practicability of the approach is demonstrated by the finite element analysis of rolling tires.
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Yoo, Yo Han, Young Sik Choi i Joon Won Lee. "Influence of Blast Wave on Behavior of Steel Plate". Applied Mechanics and Materials 619 (sierpień 2014): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amm.619.28.
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The threat of terrorism has led to increased awareness about protecting properties from damage in terrorist attacks. With the rapid growth of the computer industry and progress in the field of finite-element analysis, evaluations of conventional weapons focus more on simulations than on experiments. There are many approaches to simulate blast and impact. These include Eulerian, Lagrangian, multi-material arbitrary Lagrangian-Eulerian (MM-ALE), and the meshless approach of smooth particle hydrodynamics (SPH) methods. Each method has distinct advantages. In this study, finite-element analysis was applied to simulate a 1 kg trinitrotoluene (TNT) blast in front of a 20-mm-thick steel plate. Three different approaches were simulated: Eulerian, MM-ALE, and SPH. Each method gave different results for the von Mises stress distribution, peak pressure, and displacement of the steel plate. A comparison of the three results implies that using one of these three approaches may generate a significant blast simulation.
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Antona, Rubén, Renato Vacondio, Diego Avesani, Maurizio Righetti i Massimiliano Renzi. "Towards a High Order Convergent ALE-SPH Scheme with Efficient WENO Spatial Reconstruction". Water 13, nr 17 (4.09.2021): 2432. http://dx.doi.org/10.3390/w13172432.
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This paper studies the convergence properties of an arbitrary Lagrangian–Eulerian (ALE) Riemann-based SPH algorithm in conjunction with a Weighted Essentially Non-Oscillatory (WENO) high-order spatial reconstruction, in the framework of the DualSPHysics open-source code. A convergence analysis is carried out for Lagrangian and Eulerian simulations and the numerical results demonstrate that, in absence of particle disorder, the overall convergence of the scheme is close to the one guaranteed by the WENO spatial reconstruction. Moreover, an alternative method for the WENO spatial reconstruction is introduced which guarantees a speed-up of 3.5, in comparison with the classical Moving Least-Squares (MLS) approach.
Rozprawy doktorskie na temat "ALE-Lagrangian approach"
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Trevino, Theodore. "Applications of Arbitrary Lagrangian-Eulerian (ALE) analysis approach to underwater and air explosion problems". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384983.
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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, Sept. 2000.Thesis advisor(s): YShin, Young S. "September 2000." Includes bibliographical references (p. 175-177). Also available in print.
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Seetamsetti, Arun Santosh. "Comparison of finite element analysis of impact on water and soil using Lagrangian, ALE, and SPH approaches and airframe impact applications". Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/5421.
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According to Federal Aviation Administration (FAA) reports on aircraft accidents, 80 percent of all crashes occur on water and land. The research in this thesis used computational finite element modeling and analysis to study the effects of impacts on water and soft soil with respect to the structural integrity of an aircraft’s airframe during a crash. The effects of these impacts play a vital role in the design phase of an aircraft.
The objective of this research was to compare the computational finite element technique for impact on water and soil, and to correlate it with the experiments. The nonlinear explicit finite element code together with the equation of state (EOS) and fluid-structure interaction (FSI) are used in the arbitrary Lagrangian-Eulerian (ALE) technique. A validation study of water and soft-soil properties on impact analyses was carried out in three different experimental phases using the following: a rigid spherical ball, a penetrometer, and a flask ball. Finally, an airframe structure study was conducted in water and soil. Initially, the impact simulations were carried out using Lagrangian analysis, followed by the ALE technique, and then the smoothed particle hydrodynamics (SPH) method. Acceleration was observed as an important parameter to validate in the analysis. Both ALE and SPH methods showed more accurate results than those obtained using Lagrangian analysis and were similar to that of the experimental data. Comparing the results from analyzing water and soil impacts with a rotorcraft indicated that water impact produces 33% less g-value and around 90% deformation compared to soil impact, thus indicating that impact on a water surface might be safer than impact on a soil surface. The impact study on water and soil was intended to evaluate the general behavior of the deformation, or g-value, for structural analyses only, and results show that the Lagrangian approach is recommended, if the soil and water is of small interest.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
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Srivastava, Shweta. "Stabilization Schemes for Convection Dominated Scalar Problems with Different Time Discretizations in Time dependent Domains". Thesis, 2017. http://etd.iisc.ernet.in/2005/3574.
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Problems governed by partial differential equations (PDEs) in deformable domains, t Rd; d = 2; 3; are of fundamental importance in science and engineering. They are of particular relevance in the design of many engineering systems e.g., aircrafts and bridges as well as to the analysis of several biological phenomena e.g., blood ow in arteries. However, developing numerical scheme for such problems is still very challenging even when the deformation of the boundary of domain is prescribed a priori. Possibility of excessive mesh distortion is one of the major challenge when solving such problems with numerical methods using boundary tted meshes. The arbitrary Lagrangian- Eulerian (ALE) approach is a way to overcome this difficulty. Numerical simulations of convection-dominated problems have for long been the subject to many researchers. Galerkin formulations, which yield the best approximations for differential equations with high diffusivity, tend to induce spurious oscillations in the numerical solution of convection dominated equations. Though such spurious oscillations can be avoided by adaptive meshing, which is computationally very expensive on ne grids. Alternatively, stabilization methods can be used to suppress the spurious oscillations.
In this work, the considered equation is designed within the framework of ALE formulation. In the first part, Streamline Upwind Petrov-Galerkin (SUPG) finite element method with conservative ALE formulation is proposed. Further, the first order backward Euler and the second order Crank-Nicolson methods are used for the temporal discretization. It is shown that the stability of the semi-discrete (continuous in time) ALE-SUPG equation is independent of the mesh velocity, whereas the stability of the fully discrete problem is unconditionally stable for implicit Euler method and is only conditionally stable for Crank-Nicolson time discretization. Numerical results are presented to support the stability estimates and to show the influence of the SUPG stabilization parameter in a time-dependent domain.
In the second part of this work, SUPG stabilization method with non-conservative ALE formulation is proposed. The implicit Euler, Crank-Nicolson and backward difference methods are used for the temporal discretization. At the discrete level in time, the ALE map influences the stability of the corresponding discrete scheme with different time discretizations, and it leads to schemes where conservative and non-conservative formulations are no longer equivalent. The stability of the fully discrete scheme, irrespective of the temporal discretization, is only conditionally stable. It is observed from numerical results that the Crank-Nicolson scheme induces high oscillations in the numerical solution compare to the implicit Euler and the backward difference time discretiza-tions. Moreover, the backward difference scheme is more sensitive to the stabilization parameter k than the other time discretizations. Further, the difference between the solutions obtained with the conservative and non-conservative ALE forms is significant when the deformation of domain is large, whereas it is negligible in domains with small deformation.
Finally, the local projection stabilization (LPS) and the higher order dG time stepping scheme are studied for convection dominated problems. The analysis is based on the quadrature formula for approximating the integrals in time. We considered the exact integration in time, which is impractical to implement and the Radau quadrature in time, which can be used in practice. The stability and error estimates are shown for the mathematical basis of considered numerical scheme with both time integration methods. The numerical analysis reveals that the proposed stabilized scheme with exact integration in time is unconditionally stable, whereas Radau quadrature in time is conditionally stable with time-step restriction depending on the ALE map. The theoretical estimates are illustrated with appropriate numerical examples with distinct features. The second order dG(1) time discretization is unconditionally stable while Crank-Nicolson gives the conditional stable estimates only. The convergence order for dG(1) is two which supports the error estimate.
Książki na temat "ALE-Lagrangian approach"
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Applications of Arbitrary Lagrangian Eulerian (ALE) Analysis Approach to Underwater and Air Explosion Problems. Storming Media, 2000.
Znajdź pełny tekst źródłaStreszczenia konferencji na temat "ALE-Lagrangian approach"
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Owczarek, P., i H. J. M. Geijselaers. "Analysis of Thermo-Mechanical Distortions in Sliding Components: An ALE Approach". W STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71167.
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A numerical technique for analysis of heat transfer and thermal distortion in reciprocating sliding components is proposed. In this paper we utilize the Arbitrary Lagrangian Eulerian (ALE) description where the mesh displacement can be controlled independently from the material displacement. A stationary and a moving component are modeled respectively as Lagrangian (mesh displacement equals material displacement) and Eulerian (mesh is fixed in space and material moves through the mesh). The description of the contact between both components accounts for frictional heating and heat exchange.
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Kim, Jae-Hyun, Byung-Young Jeon i Jae-Hwang Jeon. "Application of Fluid-Structure Interaction Technique for Underwater Explosion Analysis of a Submarine Liquefied Oxygen Tank Considering Survivability". W ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-58009.
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The design of submarines has continually developed to improve survivability. Explosions may induce local damage as well as global collapse to a submarine structure. Therefore, it is important to realistically estimate the possible damage conditions due to underwater explosions in the design stage. In the present study, the Arbitrary Lagrangian-Eulerian (ALE) technique, a fluid–structure interaction approach is applied to simulate an underwater explosion and investigation of the survival capability of a damaged submarine with clamped liquefied oxygen tank. The Lagrangian-Eulerian coupling algorithm, the equations of state for explosives and seawater, and the simple calculation method for explosive loading were also reviewed. It is shown that underwater explosion analysis using the ALE technique can reasonably evaluate the structural damage caused by explosive load.
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COLLÉ, ANTHONY, ÉRÔME LIMIDO, SIMON DALLE PIAGGE i FRÉDÉRIC PAINTENDRE. "INNOVATIVE MESHLESS APPROACH FOR SHAPED CHARGES MODELLING VS EXPLOSIVE REACTIVE ARMOR". W 32ND INTERNATIONAL SYMPOSIUM ON BALLISTICS. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/ballistics22/36065.
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We focus on shaped charges modeling. Combining large deformations, numerous interface productions and strong damages mechanism, those events are numerically challenging. Eulerian finite element methods are classically used. However, they induce very long computation times, accuracy losses and need opening criteria to deal with failure. Among the Lagrangian approaches the meshless methods called Smoothed Particle Hydrodynamics appears as a relevant alternative to prevent such shortcomings. We propose to use an alternative scheme called -SPH-ALE. Based on the ALE framework, it achieves robust and consistent stabilization through an arbitrary description of motion. Its implementation on a Viper shaped charge shows that the scheme handles the jet generation process as well as its resulting interaction with an ERA target. Both stability and accuracy are increased with respect to classical approaches. Also, taking advantage of GPU computing, such results are achieved in reduced computation times with respect to classical CPU implementations.
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Rajaomazava, Tolotra Emerry, Mustapha Benaouicha i Jacques-André Astolfi. "Numerical Analysis of Hydrofoil Dynamics by Using a Fluid-Structure Interaction Approach". W ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78389.
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In this paper, the flow over pitching and heaving hydrofoil is investigated. The viscous incompressible Navier-Stokes problem in Arbitrary Lagrangian-Eulerian (ALE) formulation is solved using the finite elements code Cast3M. The projection method is used to uncouple the velocity and pressure fields. The implicit Euler scheme is applied for time discretization of fluid equations. The dynamics of the hydrofoil is governed by a non-linear ordinary differential equation. The non-linear coupled problem is solved using the explicit staggered algorithm. The effects of fluid-structure interaction on hydrofoil dynamics and pressure center position are analyzed.
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Mohaghegh, F., H. S. Udaykumar, J. Mousel, V. Chivukula i K. B. Chandran. "Implementation of Smoothed Profile Modeling in Two Phase Flow Analysis of RBCs in Blood". W ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80508.
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Analysis of blood as a two phase flow of densely packed finite size particles is a challenging problem that requires a numerical approach that can efficiently and accurately handle large numbers of objects moving through a fluid. Numerical schemes such as the Arbitrary Lagrangian-Eulerian method (ALE), Distributed Lagrangian Multiplier (DLM) or the Immersed Boundary Method (IBM) are useful for simulating particulate flows. However, in the development of a multiscale framework where the dynamics of particles may be evolved at different scales, these methods may be too expensive for the desired resolution.
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Mohtat, Ali, Ravi Challa, Solomon C. Yim i Carolyn Q. Judge. "Numerical Modeling of Hydrodynamic Impact and Local Slamming Effects". W SNAME 13th International Conference on Fast Sea Transportation. SNAME, 2015. http://dx.doi.org/10.5957/fast-2015-048.
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Numerical simulation and prediction of short duration hydrodynamic impact loading on a generic wedge impacting a water free-surface is investigated. The fluid field is modeled using a finite element (FE) based arbitrary Lagrangian-Eulerian (ALE) formulation and the structure is modeled using a standard Lagrangian FE approximation. Validation of the numerical method against experimental test data and closed form analytical solutions shows that the ALE-FE/FE continuum approach captures the impact behavior accurately. A detailed sensitivity analysis is conducted to study the role of air compressibility, deadrise angle, and impact velocity in estimation of maximum impact pressures. The pressure field is found to be insensitive to air compressibility effect for a wide range of impact velocities and deadrise angles. A semi-analytical prediction model is developed for estimation of maximum impact pressures that correlates deadrise angle, impact velocity, and a nonlinear interaction term that couples hydrodynamic effects between these parameters. The numerical method is also used to examine the intrinsic physics of water impact on a high-speed planing hull with the goal of predicting slamming loads and resulting motions.
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Erdik, Atil, Namik Kilic, Mustafa Guden i Alper Tasdemirci. "Numerical Approach to Design Process of Armored Vehicles". W ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25069.
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Today, it is imperative that armored vehicles need advanced protection kits against anti-symmetric threats more than before. The primary goal of this study was to assess benefits of explicit hydrocodes for mine protection resistance of armored vehicles. An analysis of an armored vehicle under blast loading caused by high explosive (HE) detonation is presented with comparison to a full-scale test. The problem was examined using LS-DYNA which is an explicit non-linear finite element code. Multi Material Arbitrary Lagrangian Eulerian (MM-ALE) Fluid Structure Interaction Method was selected to model the explosion domain so as to observe advancing of the shock wave in the compressed air and to investigate the effects of blast on the vehicle structure after explosion. Johnson-Cook constitutive material model, Jones-Wilkins-Lee (JWL) and Linear Polynomial equation of states were used for the problem. Results show that numerical analysis was in good agreement with the experimental result.
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Koochekali, Alahyar, Behrouz Gatmiri i Amirabbas Koochekali. "Pipeline Upheaval Buckling in Clayey Backfill and Shore Approach". W ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24521.
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True estimation of soil response during pipeline upheaval buckling is a key parameter in the safe design of subsea buried pipeline. In this paper the effects of sea mean water level over the buried pipeline and the effects of pipe burial depth on the soil response during vertical buckling are investigated. For that purpose a numerical modeling of pipeline upheaval buckling in clayey backfill has been conducted. Different sea mean water levels are considered to simulate the pipeline shore approach. In addition, various pipeline burial depths are considered to predict the soil uplift resistance and the soil failure mechanism. In order to model the large penetration of pipeline into the soft clay, Arbitrary Eulerian Lagrangian (ALE) method is employed. The results reveal that in the shallow water the sea mean water level may have considerable effects on the soil failure mechanism and soil uplift resistance. In addition, as the sea mean water level and pipe burial depth increases, a new transitional failure mechanism can be observed. The mechanism is a combination of vertical sliding block mechanism and the flow-around mechanism.
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Wang, Yeqing, Olesya I. Zhupanska i Crystal L. Pasiliao. "Verification of a Manual Mesh Moving Finite Element Analysis Procedure for Modeling Ablation in Laminated Composite Materials". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70623.
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One of the prevalent approaches to model ablation problems is to use the UMESHMOTION subroutine and the Arbitrary Lagrangian-Eulerian (ALE) adaptive remesh algorithm in ABAQUS (i.e., a commercial, general purpose Finite Element Analysis (FEA) software). However, the approach is not applicable for ablation problems when the material removal proceeds from one material domain to another, such as for ablations of laminated composite materials when the surface recedes from one laminate layer to another layer with different material orientations. In this paper, a novel procedure, based on manual mesh moving FEA with ABAQUS, is proposed to solve the ablation problems for laminated composite materials. The proposed procedure is verified by comparing the predictions of temperature and ablation histories of a two-dimensional isotropic panel (i.e., with single material domain) with those obtained using the traditional UMESHMOTION+ALE method. In addition, a case study is presented to demonstrate the successful application of the proposed procedure for the prediction of the thermal and ablation response of a laminated carbon fiber reinforced epoxy matrix (CFRP) composite panel subjected to a high-intensity and short-duration radiative heat flux.
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Fredj, Abdelfettah, i Aaron Dinovitzer. "Three-Dimensional Response of Buried Pipelines Subjected to Large Soil Deformation Effects: Part II—Effects of the Soil Restraint on the Response of Pipe/Soil Systems". W 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31517.
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Understanding the effect of soil-pipeline interactions in the event of large ground movement is an important consideration for pipeline designer. Both experimental investigation and computational analyses play significant roles in this research. As part of this effort, a framework incorporating continuum soil mechanics and advanced finite element approach (i.e., ALE and SPH method) for modeling soil pipe interaction is developed. The overall objective is to develop, validate and apply 3D continuum modeling technique to assess the performance of pipeline system subjected to large soil displacement. The numerical models than may be used to predict the wrinkle formation and post formation behavior of the pipeline considering the effect of the soil confinement, and develop a comprehensive wrinkle integrity assessment process. This is the second paper (Part II) in a series of two papers. In the first paper a three-dimensional Continuum models using MM-ALE (Multi-material Arbitrary Eulerian Lagrangian) and SPH (smooth particle hydrodynamics) approaches are developed and run using LS-DYNA. The results are compared with published experimental data of large-scale test to verify the numerical analysis methods. In this paper (Part II) the effects of soil restraint on the response of the pipe/soil systems (e.g., pipeline Wrinkle and buckle, strain demand) are discussed.