How to implement PISO algorithm based on the colocated grid -- CFD Online Discussion Forums

July 31, 2020, 05:58	How to implement PISO algorithm based on the colocated grid	#1
lietoflaw New Member lipeng Join Date: May 2018 Posts: 16 Rep Power: 8	I have written my lid-driven code with SIMPLE on MATLAB following the instruction from Ferziger's book. And I want to change it to get a PISO case, however, it occured to me that due to previous work based on the colocated grid, the $\tilde{u_{f}'}=-\sum_{}^{}A_{l}u_{l}'/A_{P}$ cant be obtained directly on the colocated grid. So I think that I need to interpolate the nodal value to get that. The question is : Can $\tilde{u_{f}'}$ be calculated by simple interpolation or something like momentum interpolation? Or PISO requires a different way to implement on the colocated grid, which is not same with the description in Ferziger's book? I will appreciate it if you can provide any suggetion or tutorial. Thank you in advance!

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