[zellixa]

Hi all,

I've been simulating fluid flow within a pipe with baffles to enhance heat transfer, my mesh has worked fine with larger spacings even with LARGE baffles that take up nearly the whole pipe. However, now with a small spacing ratio my residuals are diverging, i'm assuming this is because of the massive turbulence the baffles have induced. I'm not sure how to refine the area circled in red but I think that's where my problem lies?


If anyone could help it would be greatly appreciated, or if anyone has any other suggestions as to why this is happening?

Thanks!

[srsel6]

Originally Posted by zellixa

Hi all,

I've been simulating fluid flow within a pipe with baffles to enhance heat transfer, my mesh has worked fine with larger spacings even with LARGE baffles that take up nearly the whole pipe. However, now with a small spacing ratio my residuals are diverging, i'm assuming this is because of the massive turbulence the baffles have induced. I'm not sure how to refine the area circled in red but I think that's where my problem lies?


If anyone could help it would be greatly appreciated, or if anyone has any other suggestions as to why this is happening?

Thanks!

Zellixa, is your problem a 2D problem?

Post some pictures of your mesh statistics. Quality, skewness, aspect ratio and orthogonal quality.

Also, what governing equation are you using? What pressure-velocity coupling scheme?

One way you can improve the mesh in that region is to perform solution based mesh adaptation. But you're gonna need a solution first.

Or you could use a sphere of influence mesh. Go to sizing > click the vertex option on the ribbon section of the GUI > and select the closest vertex. Now you can set the radius of the sphere and the sizing of elements inside the sphere.

Also, redo your mesh. Try to get a structured mesh. If it's a 3D problem, you could try using cutcell and add inflation layers. If not, go for hex dominant method.

If it's 2D, go for quadrilateral dominant.

Overall, I suspect it's not just that area that is causing your divergence. It's your overall mesh. Hope this helps, let me know if you need anymore help