Code solution needs better grid than COMSOL

Moreza7 · July 8, 2019, 06:54

Hi,
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:

FMDenaro · July 8, 2019, 07:01

Before any discussion, post the plots of the variables corresponding to the classical literature for this problem

July 8, 2019, 06:54	Code solution needs better grid than COMSOL	#1
Moreza7 Senior Member Join Date: Jan 2018 Posts: 121 Rep Power: 8	Hi, 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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July 8, 2019, 07:01		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,877 Rep Power: 73	Before any discussion, post the plots of the variables corresponding to the classical literature for this problem