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Computational Domain Changes Radically During Parametric Flow Study


For an extra-curricular project, I am designing an injector plate, no moving parts, just two fluid channels that do not meet inside the simulation. I created a parametric study for an internal flow sim with 2 sizes for each of the six dimensions.

The first design point is simulated correctly, but the rest appear to be using an invalid computational domain that is different from the one I specified. How do I stop the domain from changing between iterations?