[tyw7]

My 3D wing run residuals aren't converging

Any idea how to improve this?

My box are 10x the chord length.

[karachun]

https://www.cfd-online.com/Wiki/Ansy...gence_criteria

[tyw7]

I don't suppose you have access to the 2020R2 CFX manual or know where I can download it? I'm using a lab computer for CFX but I want to read the manual on my own pc. However, it's asking me to register using an Ansys customer ID.

Edit: how can I do this? "View the residuals on a representative plane or as a isosurface with a lower then your maximum residual as value."

What do you mean iso surface with a lower than your maximum residual as value?

[karachun]

For manual - use older versions available on the internet, or ask your advisor for access to documentation.
For residuals - in the output control tab enable "Output Residuals" checkbox. Thus your results will contain residuals and you can work with them like with other variables.

[tyw7]

Thanks. I've checked my residuals and they look to constant.

I plot them as a contour on a plane on the XY axis.

[karachun]

BTW, 40 iterations is usually too low to achieve convergence. Do you run simulation for longer periods? Residuals may "bounce" - decline non monotonically, with some local "peaks".

[tyw7]

I will run it overnight with more runs