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Assigning values to a cartesian grid from a binary image (or stl) |
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#1 |
Senior Member
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18 ![]() |
Dear all,
I stuck with the problem of assigning value to a field (let's call it alpha). Let's say I have a very fine cartesian grid generated with blockMesh and that I want to assign value to a field alpha defined on this grid in order to match the binary image shown below. The cells in the black region will have the value 1 and the cells in the white region will have the value alpha=0. I have a .stl file of this file and I am able to generate a grid with snappyHexMesh for either the black region. Then with mapField I can assign the value I want for alpha. However, the workflow is a little far-fetched. Do you think of a more direct way to assign this value? Using snappyHexMesh and this *.stl file to assign values to my field alpha defined on a cartesian grid ? Any ideas will be strongly appreciated. Cheers, Cyp ![]() |
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#2 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,901
Rep Power: 37 ![]() ![]() |
Hi Cyp,
I cannot check right here, but at least there is an option called surfaceToCellSet in some OF-version. In the more recent ones, I would expect that you can find it in connection with topoSet. Note, that when using surfaceToCellSrt you define a stl-surface and a number of points. These are either inside or outside of the STL (additional flags), but the important thing is that you will probably need a lot of points, because the STL is by no means convex. You might even be able to use surfaceToCell directly inside setField? Good luck, Niels
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