# Best way to calculate residuals

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 August 17, 2006, 09:24 Best way to calculate residuals #1 Morteza Guest   Posts: n/a Hi Guys, What is the best way to calculate residuals of U, V and Pressure correction equations in SIMPLE algorithm. I have developed a Code that gives correct values but the amount of residuls for each equation in each iteration is so high! I guess that something wrong in the way for calculation of residuals. Now, my code calculates the difference between LHS and RHS of discretized equation for each grid point and the absolute values of this difference for all grid points are added to each other as the value of residual in each iteration. Thank you in adavnce for your comments and ideas. Morteza

 August 19, 2006, 23:44 Re: Best way to calculate residuals #2 student Guest   Posts: n/a Hi , my suggestion is residual= RHS - LHS let sum=sum+pow(residual,2);(i.e add all the square of the residuals for all grid points) at the end of each iteration find the squareroot.. that gives the correct solution.but urs procedure all rite. still u r getting wrong result , ur code might be wrong. all the best

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