Residuals and Domain values in Radiation

sgokavarapu · April 6, 2021, 5:03am

*I try to find the effect of a large hot cylinder on a small cylinder placed parallelly at a distance, through radiation and Natural convection.

*I have ran the simulation with all the settings, but The residuals are saturating above 1e-3 and the domain values of couple of variables is fluctuating (I have tried making the mesh finer but it is of no use). PFA the snips below:

The link to the project: https://www.simscale.com/workbench/?pid=5482510931967925547&mi=spec%3A2d0ad1b1-4e88-4f55-9578-83a4939e0730%2Cservice%3ASIMULATION%2Cstrategy%3A13&ps=analysis%2FConjugateHeatTransfer--oneOf%2Fnumerics

Kindly help @tsite

tsite · April 6, 2021, 7:36am

Hey there! Have you performed a mesh sensitivity study? I expect a finer mesh could deliver much better results. You can check this page as a start: How to Check and Improve Mesh Quality | SimScale
Also keep in mind that with the Conjugate heat transfer v2 , you are performing a compressible analysis.

Let me know how a finer mesh performs.

Best regards,
Fillia

sgokavarapu · April 7, 2021, 6:32am

Hi, I have used CHT v1 also. The snips attached are of that only. I have used a fineness of 7 in meshing. On Further increasing the fineness the meshing fails due to lack of memory,

Regards,
Srikar.

sgokavarapu · April 8, 2021, 4:43am

Hi @tsite , I have ran a new simulation “Run 4” with finer mesh, but the results are same. I could not not decrease the non-orthogonality of the mesh. Kindly help.

Regards,
Srikar.