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In 3D a cylinder is trickier due to aspect ratio depending on its dimensions. For 3D a sphere avoids that issue. For 2D a cylinder (infinite length in 3D). If your Cd and flow pattern are consistent with reference data from these well-studied standard shapes, that validates the computational method. Then simulations of unknown shapes carry more confidence to make relative drag comparisons. Ultimately, validation testing is required for absolute proof. (That's what I learned from working with professionals doing computational analysis. My role was test & measurement for validation.)
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