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Showing 1 to 20 of 22 for “"Artificial Viscosity"”.
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Numerical Solutions of Nonlinear Free-Surface Wave Problems (Numerical Analysis, Filtering, Artificial Viscosity)
A numerical method was developed for solving potential flows for nonlinear free-surface wave problems with a fixed, small computational domain. The free-surface wave problem is solved as an initial value problem. The method of solving the free-surface wave problem couples the solution of the …
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Shock capturing with PDE-based artificial viscosity for an adaptive, higher-order discontinuous Galerkin finite element method
… for higher-order, adaptive methods is necessary. Artificial viscosity can be combined with a higher-order discontinuous Galerkin finite element discretization to resolve a shock layer within a single cell. However, when a nonsmooth artificial viscosity model is employed with an otherwise …
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Hypersonic heat transfer and anisotropic visualization with a higher order discontinuous Galerkin finite element method
… The strong shock is captured with a Laplacian artificial viscosity term. On average, the results are in agreement with an existing hypersonic benchmark. Second, this work improves the visualization of the higher order polynomial solutions generated by DG with an adaptive display algorithm. The …
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Investigation into smoothed particle hydrodynamics for non-newtonian droplet modelling
… this method can produce stable simulations if an artificial viscosity model is included, a third-order polynomial kernel is used and the pressure boundary condition on surface particles are non-zero.
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A Hybridized Discontinuous Petrov-Galerkin scheme for compressible flows
… oscillation at the shock. When combined with artificial viscosity, the oscillation can be completely eliminated using one order of magnitude less viscosity than that required by other Finite Element methods. Also, convergence studies in the sequence of meshes proposed by Peterson [49] show …
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Supersonic conical flow computations using a rectangular finite volume method
… An upwind density shift is used to introduce an artificial viscosity in a conservative manner to eliminate non-physical expansion shocks and add numerical damping. The rectangular finite volume method is then extended to deal with infinitely thin conical fins. Numerical tests of cones, elliptical …
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The Linearized Euler Equations for Predicting Supersonic Jet Noise of a Rectangular Jet Using OpenFOAM
… boundary dampening to prevent reflections and artificial viscosity to aid in stability. In all this allowed the leeFoam solver to produce accurate acoustic CAA results and this code could be used by any professional looking to run the Linearized Euler Equation for there workflow.</p>
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On the Application of an Output-based Adaptive, Higher-order Finite Element Method to Sonic Boom Propagation
… for a volume output functional. Additionally, artificial viscosity is incorporated via a shock sensor PDE approach to handle shock presence, with necessary corrections applied to the DWR error estimate. The VMSD-BR2 method is applied then to a real-world scenario solving the augmented Burgers …
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A discontinuous Galerkin spectral element method compressible flow solver
… capabilities. Novel nonlinear filter-based artificial viscosity methods have been developed for effective regularization of challenging scalar transport problems in high-order methods and have found application in shock-capturing for the compressible flow solver. Moving-mesh capabilities via …
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Aerodynamic inverse design of transonic turbomachinery cascades
… march the solution to steady state. Non-linear artificial viscosity is added to eliminate pressure-velocity decoupling and to capture shocks. Convergence is accelerated using local time stepping and implicit residual smoothing. The boundary conditions at inflow and outflow are based on the …
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Improving shock-capturing robustness for higher-order finite element solvers
… along with shock-capturing methods such as artificial viscosity, can be used to resolve the shock by targeting the key flow features for grid refinement. This is a powerful tool, but cannot proceed without first converging on an initially coarse, unrefined mesh. These coarse meshes suffer …
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SPH modeling of the vertical flow structure and turbulence in the swash
… length, distance between particles, and artificial viscosity will be described, and the simulated flows and turbulence will be discussed.
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Finite element analysis of shear band failure with particular reference to circular plate impact
… gradients is achieved through the use of an artificial viscosity scheme. The impact conditions along the contacting interface are governed by the use of a penalty-based slideline technique which permits arbitrarily large relative deformations of the contact surfaces. With the foregoing …
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Viscosity stabilized adjoint method for unsteady compressible Navier-Stokes equations
… unsteady flow equations is modified by adding artificial viscosity to the adjoint equations. The additional viscosity stabilizes the adjoint solution and maintains reasonable accuracy of the gradients obtained from it. The accuracy of the method is assessed on multiple turbulent flow problems, …
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An hp-Adaptive Petrov-Galerkin Method for Steady-State and Unsteady Flow Problems
… (SA) turbulence model. Also, a PDE-based artificial viscosity has been added to the governing equations, to stabilize the solution in the vicinity of shock waves. For accurate representation of the geometric surfaces, high-order curved boundary meshes have been generated and the interior …
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An adaptive high order Reynolds-averaged Navier-Stokes solver with transition prediction
… capturing technique based on the addition of artificial viscosity is developed to handle shocks. The model is driven by a non-dimensional form of the divergence of the velocity, designed so that sub-cell shock resolution is achieved when a high order discretization is used, independently of …
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An investigation of Lagrangian Riemann methods incorporating material strength
… hydrocodes are also constructed using outdated artificial viscosity schemes which are known to diffuse shock waves and other steep features which may be present in the solution.<br/><br/>In the work presented here, a novel two-dimensional Lagrangian solver has been developed Vucalm-EP which …
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A Meshless Method for Magnetohydrodynamics and Applications to Protoplanetary Disks
… void and clump detection algorithm. Dynamic artificial viscosity fields provide stability to the integration. The resulting algorithm provides a robust solution for modeling flows that require Lagrangian or adaptive discretizations to resolve. The code has been parallelized by adapting the …
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Meshless hydrodynamic simulations of young supernova remnants
… (e.g., smoothing length, number of neighbours, artificial viscosity, and particle resolution) for each meshless method that gave the best agreement with the exact solution. We then carried out 2D and 3D simulations of the hydrodynamic interaction of the supernova ejecta with varying density …
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