5. Modify the physical model and grid

Goal

Explore geometry, resolution, transport, or solver settings.

Configuration

The systems in this tutorial were generated using meshSize = 8e-6 m, borderTol = 0, and grainsTol = 0. The inlet boundary was placed at the top using inletLocation = "top".

Change one parameter at a time to evaluate its effect. For example, decrease meshSize for a finer mesh, adjust borderTol and grainsTol to change the level of detail retained during border and grain extraction, or change inletLocation to select another injection side.

The configuration reference includes images showing the effect of different meshSize values on the generated grid and different borderTol and grainsTol values on the extracted borders and grain contours. Consult these examples before selecting values for a new image.

Command

pymm -i microsystem.png -p parameters.toml -t mesh_flow

How it works

mesh_flow rebuilds the image-derived mesh and then recomputes the steady flow field. See the configuration reference for accepted values, units, and illustrated parameter examples.

Result

Compare the new mesh and VTK data with the previous output directory. Use meshSize = 8e-6 m, borderTol = 0, and grainsTol = 0 as the baseline values. Inspect the generated mesh when changing meshSize and the extracted border and grain contours when changing borderTol or grainsTol.

Next

Continue with 6. Run the complete workflow.