[Marcus6688]

Hello everyone,

I'm customizing OPF tutorial multiRegionHeater which uses solver chtMultiRegionFoam to check physics.
In this thread, I hope to discuss about my result.

From the tutorial, I try increasing kappa of heater up to 300 [W/K.m] and refine the mesh.
The result shows that there is high temperature gradient spot from heater to fluid domain. I modified case setting (timestep, fvSchemes, fvSolution, boundary patch, energyCoupling, solver mode) to solve problem of high temperature gradient spot between regions but it did not work well. What is reason behind problem of temperature jump at region interfaces?
I appreciate your help to figure out this problem. Thanks.

Screenshot 2025-10-31 173803.jpg