Abstract
By using the idea of resonant triad of the theory of hydrodynamic stability, the effect of pressure gradient on coherent structures in a turbulent boundary layer is investigated. The favorable pressure gradient suppresses the generation of the coherent structure, while the adverse pressure gradient has the opposite effect. The scale, form, as well as the propagation speed of the coherent structures are different from those with zero pressure gradient. The theoretical results are, in general, in agreement with those found from experiments. From the calculated probability density curve of the circulation differences of the nearly streamwise vortex pairs, it is found that the adverse pressure gradient makes the vortex pair more symmetric.
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Project supported by the National Natural Science Foundation of China.
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Zhou, H., Lu, L. Effect of pressure gradient on coherent structures in a turbulent boundary layer. Sci. China Ser. A-Math. 40, 441–448 (1997). https://doi.org/10.1007/BF02911447
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DOI: https://doi.org/10.1007/BF02911447