Curvature sensitive nonlinear turbulence model |
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Authors: | Qian Weiqi Fu Song |
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Institution: | (1) Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, China |
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Abstract: | By modifying the Rodi assumption to take account of the influence of flow curvature, a new curvature modified algebraic stress
model (CMASM) is developed from the second moment closure in the generalized curvilinear coordinate system. And the explicit
form of the ASM, a new curvature modified nonlineark-ε model (CMNKE), is derived in the orthogonal curvilinear coordinate system. This new nonlineark-ε model is further validated by a numerical simulation of a two-dimensional U-type turnaround duct flow. The results show that
the CMNKE can effectively capture the main characteristic of this curvature flow and simulate the damping effect of the shear
stress by a convex curvature and the enhancing effect by a concave curvature. So, this model is a rational and effective simplification
to the second moment closure.
The project supported by the National Natural Science Foundation of China (19725208) and the National Climbing project of
China |
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Keywords: | turbulence curvature effect algebraic stress model nonlineark-ε model |
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