Community Research and Development Information Service - CORDIS

New submodel for turbulence and wall treatment to be used for the simulation of turbulent flow and heat transfer inside an IC engine.

The result is a turbulence submodel that is sufficiently robust for use in complex flow computations within IC engines. Since the modelling close to the wall is crucial for reliable and accurate heat transfer predictions, the model must reproduce the near wall anisotropic behaviour of turbulence.

Compared to the standard k-e model (which is the most widely used model for complex flows in IC engines) only one additional partial differential equation for the elliptic blending parameter gamma needs to the solved.

This parameter quantifies the wall blocking effect and its solution is very fast, thus the additional computational overhead is minimised. Wall functions for the new variable, which result in coarser grid resolution close to the wall, are also developed. Turbulence anisotropy is accounted for away from the wall as well. The submodel does not use the distance from the wall and thus is applicable to complex geometries.

Reported by

King's College London
Department of Mechanical Engineering, Strand,
WC2R 2LS London
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