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Static adaption is faster as it's done once and not updated. However, if the region (flow feature) that needs the refinement moves you've refined the wrong part of the model. It's a trade off. nOne option to save on cell count is to run in 2d or with only 1 cell across a thin domain. We often do this for testing newer models or where we want to check settings before running a much larger model (ie 150M cells or more). n