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Code solution needs better grid than COMSOL

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Old   July 8, 2019, 05:54
Default Code solution needs better grid than COMSOL
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I wrote a code to solve a 2d lid-driven cavity using SIMPLE algorithm.
The grid is 50x50 and the Reynolds number is 1000.

Then, I simulated the same problem with the same grid using COMSOL and noticed that the results are a bit different.

I need to use a 100x100 grid for the code to get the same results of COMSOL's solution with a 50x50 grid!

Why is this happening?

My code using a 50x50 grid:

COMSOL using a 50x50 grid:

My code using a 100x100 grid:
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Old   July 8, 2019, 06:01
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Filippo Maria Denaro
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Before any discussion, post the plots of the variables corresponding to the classical literature for this problem
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