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How do CFD softwares calculate derivatives in unstructured grids?

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Old   August 4, 2019, 05:25
Question How do CFD softwares calculate derivatives in unstructured grids?
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Suppose that we have the following unstructured grid:




I want to know that how do CFD softwares like ANSYS Fluent calculate the derivatives in this grid?


Is this possible to write a universal code for it to calculate the values in any unstructured grid?
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