As demonstrated in the answer posted by FiPy uses the faceNormal internally and expects it to obey the conventions we have defined, i.e., that it always points into the second cell. A face has two bounding cells if the face is on the exterior, then both bounding cells are the same.Īnd faceNormal directions (which are shown in the picture using FiPy mesh.FaceNormals) have no effect on the solution, by themselves This means that it can be considered in opposite directions by the solver depending on the circumstances. No, as stated in the link you posted, FiPy considers the faceNormal direction to be into the second of the two cells bounding a face. Is it right? Is there any FiPy mesh modules to create such O'grid cylindrical type meshing system, in which x, y, and z coordinates of the nodes could be available? I have tried 'CylindricalGrid2D' for radial meshing, but it gives only r and z coordinates of the nodes.įiPy considers faceNormal direction of a shared face outward to the neighbor cell, Q FiPy: Do these face normal direction changes have any effect on FiPy solving results?Īs I understood it from the recent explanation (I couldn't ask this question there duo to not having enough reputation quorum), FiPy considers cell faceNormal direction of a shared face outward to its corresponding neighbor cell, and faceNormal directions (which are shown in the picture using FiPy mesh.FaceNormals) have no effect on the solution, by themselves This means that it can be considered in opposite directions by the solver depending on the circumstances. I have changed the clockwise Start-End mesh face normals direction to counterclockwise by the following code, due to my needs to use counterclockwise faceNormals direction: for i in range():įor f in .T: Note: I have imported this mesh file into python FiPy by Gmsh3D and used its faceNormals and cellCenters to plot the face normals by matplotlib. Q OpenFOAM: Do these face normal directions result in wrong results? or results are controlled, only, by Right-Hand rule? Is there any code or way to change these directions, if it is needed? As it is obvious, in this way, mesh faces on Start-End overlapping plane have opposite directions comparing to the other rotational face normals. Mesh file have been exported to be plotted inside python, as above right picture. Q OpenFOAM: Is there any function code or way to plot them inside paraFoam? It is possible to plot boundary mesh faces (which are on top, bottom, inner and outer cylinder walls) by Glyph normals, but not the internal mesh faces. I have tried to plot face normals by OpenFOAM compiled paraFoam, but I couldn't. In this model, flow will be flow from outer cylinder wall to the inner cylinder wall Right-Hand law is used for meshing points as below: I have meshed a hollow cylinder shape in OpenFOAM.
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