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How to calculate unsteady residual

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Old   October 21, 2012, 03:27
Default How to calculate unsteady residual
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Is there a function available to calculate something like

\sum_{i=1}^{ncells} \left( \frac{\rho^n_i - \rho^o_i}{\Delta t} \right)^2 V_i

I am looking for some solution like


but I dont know if such functions exist.
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