Issues in Verifying Boundary Conditions for 3D Unstructured CFD Codes

The process of code verification involves ensuring that the implementation of the code for solving the chosen set of governing equations is correct. The order of accuracy test is the most rigorous approach in performing code verification studies. This work presents the issues involved in performing the order of accuracy tests of boundary conditions for a 3D unstructured finite volume computational fluid dynamics code. The method of manufactured solutions is employed to perform the order verification of the implementation of boundary conditions in Loci-CHEM, a rule-based computational fluid dynamics code. Various boundary conditions discussed in this verification study presented are: isentropic inflow, outflow, extrapolation, slip wall (Navier-Stokes equations) and fixed mass inflow boundary conditions. These boundary conditions are verified on 2D hybrid meshes (consisting of both quadrilateral and triangular cells and having curved boundaries) as well as 3D hybrid meshes (consisting of hexahedral, tetrahedral and prismatic cells with curvilinear boundaries, skewed cells and stretched cells). Generation of manufactured solutions for each of the boundary conditions is discussed and the results of the code verification study are presented.

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