Numerical Behavior of Different COMSOL Solution Methods for a Heat Transfer Problem Coupled with a Structural Mechanics Problem

W. Joppich1, N. Kopp2, and D. Samokhvalov1
1University of Applied Sciences Bonn-Rhein-Sieg, Sankt Augustin, Germany
2Technisch Mathematische Studiengesellschaft GmbH, Bonn, Germany

We consider an object re-entering the atmosphere at high velocity and a certain angle. As the density of the atmosphere increases, the temperature of the material is increased by friction. It is of interest to know whether the body is only deformed, or if it is destroyed.

To answer this question of how the object behaves, we have coupled two heat transfer problems to a structural mechanics problem. To get the solution as fast as possible, the different solution methods of COMSOL are studied in a systematic way.

For an elliptic model problem, the number of unknowns is varied from small (approx. 125,000) to large (approx. 500,000).