![]() ![]() In the absence of a prescribed boundary condition or load, the default behavior for Abaqus/CFD is to enforce a homogeneous (zero) Neumann condition. In contrast, Neumann conditions (e.g., prescribed heat flux) are specified as loads (see “Specifying surface-based distributed heat fluxes” in “Thermal loads, ” Section 34.4.4). In practice, boundary conditions tend to appear together to collectively define a physical behavior e.g., no-slip/no-penetration conditions at a wall. Are used to prescribe the values of all primitive variables involved in a fluid dynamics calculation (e.g., velocities, temperatures, turbulence variables, wall-normal distance, etc.) Ĭan be given as “history” input data (within an analysis step) to add, modify, or remove zero-valued or nonzero boundary conditions andĬan be prescribed through the use of a co-simulation region for multiphysics problems.Ĭomputational fluid dynamics problems typically require the prescription of multiple variables such as pressure, temperature, and velocity for boundary conditions. ![]()
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