Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Method for robust and rational integration of flow and heat transfer equations up to the wall inside of IC engines using elliptic relaxation concept in conjunction with eddy-viscosity or Reynolds

In contrast to Wall Functions approach, integration of governing equations up to the wall has always been regarded as more accurate, but also much more computationally demanding due to the need to resolve near-wall layers with very fine computational grid. This fine grid clustering is the consequence of various “damping functions” used to account for wall and viscous/conductive effects on turbulence. The concept of elliptic relaxation (Durbin 1991) provides a more physical account of non-local wall-blocking effect on turbulence, flow and heat transfer, and makes it possible to achieve accurate integration with relatively mild grid clustering. We developed an improved version of the k-v2-f model and the new elliptic blending Reynolds stress model, which provide improvements in predicting flow and heat transfer in complex configurations. Both models can be combined with wall functions and thus be used in flows of complex geometry and structure where an a priori control of grid density is difficult to achieve.

Reported by

Delft University of Technology
Lorentzweg 1
2628 CJ Delft
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