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2002, Volume 4, Issue 11

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Strategic Study of CAE >> 2002, Volume 4, Issue 11

Analysis of Coherent Structures in a Turbulent Boundary Layer With Pressure Gradients

Dept. of Jet Propulsion , Beijing University of Aeronautics and Astronautics , Beijing 100083, China

Funding project：国家自然科学基金资助项目（10172016）；国家重点研究发展规划资助项目（1999022305）；国家自然科学基金重点基金资助项目（50136010） Received: 2002-06-10 Revised: 2002-07-19 Available online: 2002-11-20
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Abstract

By using the method of direct numerical simulation, the coherent structures in the wall region of a turbulent boundary layer with either steady or changing pressure gradients were studied. Initial values of the coherent structures in the wall region were obtained on the basis of the idea of resonant triad in the theory of hydrodynamic stability. It was found that the results of DNS match with those of experiments very well in many aspects. Pressure gradients have much more effect on choosing preliminary waves than on evaluating of the coherent structures. The longitudinal vortices probably result from the streak lines.

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References

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