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Center for Nonlinear Studies |
Incompressible flows are some of the most frequently encountered in industrial applications and vary from pollutant and gas dispersal to chemically reacting flows, food processing, encapsulation, casting, mold filling, and vehicle aerodynamics. For these classes of problems, mesh resolution ranging from $106$ to $108$ grid points may be required to resolve important physical phenomena and spatial features in complex geometry. The algorithmic challenges involved in solving time-dependent, incompressible flow problems hinge upon the div-free constraint, efficient treatment of the concomitant pressure equation and scalable, parallel solution algorithms. Abaqus/CFD is an entirely new software framework that provides not only a capability for multiphysics simulation with the Abaqus computational mechanics codes, but also the ability to easily support multiple physics in a single framework, e.g., incompressible flow, compressible flow, heat-conduction, thermal radiation, etc. The software framework is 100\% parallel, provides parallel load-balancing/data-migration tools, and is designed to scale to to thousands of processors. The flow solvers in Abaqus/CFD relies on edge-based data structures to implement both FVM and FEM solution algorithms. The incompressible flow solver is based on an ALE formulation with a second-order incremental projection method. The incompressible flow solver uses a hybrid FVM/FEM method that circumvents the well-known LBB div-stability, provides local-conservation and monotonicity-preserving advection for transport quantities. A parallel, algebraic multigrid preconditioner in combination with a CG solver is used to solve the node-based pressure-Poission equation providing a scalable solution strategy for a broad range of industrial applications. This talk will provide a brief survey of the multiphysics CFD framework and associated technology components. The kinematics and master balance relations for the ALE formation will be presented with the key extensions for the approximate projection method. The discretization and solution procedure will be presented with a series of industrial calculations demonstrating the application of the multiphysics CFD framework.
Host: Mikhail Shashkov