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average gradient of FVM on unstructured mesh

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Old   November 28, 2003, 12:30
Default average gradient of FVM on unstructured mesh
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When I compute viscous term, I need to use gradient on each edge of control volume. If I use cell-centered discretization, I can use average of gradients at cell centers on the two sides of an edge. How can I compute the gradient of speeds on a boundary edge. In ghost boundary cell, there is no gradient. Thanks for your help in advance.
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