Matching mesh for cyclic symmetry
Posted: Thu Jul 01, 2021 10:32 am
Hi,
I'm very much enjoying using GiD - thanks for developing it.
I'm using GiD with ERMES as a problem type, and I'm using a 'periodic boundary condition' within ERMES to set up cyclic periodicity. The model geometry is a sector/wedge of the overall cylindrical volume, and the periodic boundary condition is applied to the two side faces of the cylindrical sector. I've attached an image for clarity. Under the hood of the solver, the periodic boundary condition means that nodal values on one face are copied, rotated and applied to the equivalent node on the opposite face.
Ideally the mesh on the opposite faces should be identical, so that each node has a corresponding node on the opposite face. At the moment I'm using unstructured mesh so the mesh is not identical, and the solver has to apply a large 'tolerance' to find the closest equivalent node on the opposite face. At the moment this tolerance has to be set quite large and introduces some inaccuracy to the solver.
I'm wondering if there's a way to ensure that the mesh on the opposite faces of the sector are equivalent? I have to use tetrahedral elements - other elements are not supported by ERMES.
Many thanks
James
I'm very much enjoying using GiD - thanks for developing it.
I'm using GiD with ERMES as a problem type, and I'm using a 'periodic boundary condition' within ERMES to set up cyclic periodicity. The model geometry is a sector/wedge of the overall cylindrical volume, and the periodic boundary condition is applied to the two side faces of the cylindrical sector. I've attached an image for clarity. Under the hood of the solver, the periodic boundary condition means that nodal values on one face are copied, rotated and applied to the equivalent node on the opposite face.
Ideally the mesh on the opposite faces should be identical, so that each node has a corresponding node on the opposite face. At the moment I'm using unstructured mesh so the mesh is not identical, and the solver has to apply a large 'tolerance' to find the closest equivalent node on the opposite face. At the moment this tolerance has to be set quite large and introduces some inaccuracy to the solver.
I'm wondering if there's a way to ensure that the mesh on the opposite faces of the sector are equivalent? I have to use tetrahedral elements - other elements are not supported by ERMES.
Many thanks
James