Communications on Applied Mathematics and Computation ›› 2024, Vol. 6 ›› Issue (4): 2064-2092.doi: 10.1007/s42967-023-00304-7

• ORIGINAL PAPERS • Previous Articles     Next Articles

An Effective Model for the Simulation of Transpiration Cooling

Siegfried Müller, Michael Rom   

  1. Institut für Geometrie und Praktische Mathematik, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany
  • Received:2023-04-06 Revised:2023-08-03 Accepted:2023-08-03 Published:2024-12-20
  • Contact: Michael Rom,E-mail:rom@igpm.rwth-aachen.de;Siegfried Müller,E-mail:mueller@igpm.rwth-aachen.de E-mail:rom@igpm.rwth-aachen.de;mueller@igpm.rwth-aachen.de
  • Supported by:
    This work greatly benefited from feedback by anonymous reviewers. HH, SWF, and SO were partially funded by AFOSR MURI FA9550-18-502, ONR N00014-18-1-2527, N00014-18-20-1-2093, N00014-20-1-2787. HH was also supported by the NSF Graduate Research Fellowship under Grant No. DGE-1650604.

Abstract: Transpiration cooling is numerically investigated, where a cooling gas is injected through a carbon composite material into a hot gas channel. To account for microscale effects at the injection interface, an effective problem is derived. Here, effects induced by microscale structures on macroscale variables, e.g., cooling efficiency, are taken into account without resolving the microscale structures. For this purpose, effective boundary conditions at the interface between hot gas and porous medium flow are derived using an upscaling strategy. Numerical simulations in 2D with effective boundary conditions are compared to uniform and non-uniform injection. The computations confirm that the effective model provides a more efficient and accurate approximation of the cooling efficiency than the uniform injection.

Key words: Transpiration cooling, Darcy-Forchheimer flow, Multiscale modeling, Effective boundary conditions