Why the continuity residual is not converging in inviscid flow?

ari003 · June 13, 2019, 14:05

I ve been using Fluent to do a simulation of 2 airfoils seperated by some distance(problem statement) in inviscid steady condition. At the beginning I kept the relaxation factor as default but the continuity residual is not converging hence oscillating a lot. Even in the Cl monitor the Cl curve is not damping. Reducing the Pressure and momentum relaxation factor not solving the issue. The skewness and aspect ratio is also under control
So if anyone tells me how to troubleshoot this problem it will be of great help.

Jiricbeng · June 19, 2019, 01:50

Do you use double precision? My experience is that double precision usually improved the continuity residual significantly.

June 13, 2019, 14:05	Why the continuity residual is not converging in inviscid flow?	#1
ari003 Senior Member Arijit Saha Join Date: Feb 2019 Location: Singapore Posts: 132 Rep Power: 7	I ve been using Fluent to do a simulation of 2 airfoils seperated by some distance(problem statement) in inviscid steady condition. At the beginning I kept the relaxation factor as default but the continuity residual is not converging hence oscillating a lot. Even in the Cl monitor the Cl curve is not damping. Reducing the Pressure and momentum relaxation factor not solving the issue. The skewness and aspect ratio is also under control So if anyone tells me how to troubleshoot this problem it will be of great help.

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June 19, 2019, 01:50		#2
Jiricbeng Senior Member Jiri Join Date: Mar 2014 Posts: 218 Rep Power: 13	Do you use double precision? My experience is that double precision usually improved the continuity residual significantly.