| 摘要 |
PURPOSE: To improve the accuracy for estimating the pressure distribution without increasing calculation costs (calculation time) by decreasing the energy of a turbulent flow of a fluid with the use of an anisotropic rate by which anisotropic data related to the turbulence of the fluid are moved. CONSTITUTION: An anisotropic rateϕis a variable that can vary from 0 to 1 indicating how much a production term of a turbulence energy (k) in a transportation equation ((k) equation) representing the turbulence energy (k) by a fluid shifts from a standard model of k-ε(εis a lost ratio of the energy (k)). When a new transportation equation representing the anisotropic rateϕ(ϕequation) is used, the production term of the turbulence energy (k) in the (k) equation is adjusted and a value of the turbulence energy (k) is decreased. Moreover, when the anisotropic rateϕis multiplied by the sum of vertical stress components and shearing stress components in the production term of the turbulence energy (k), errors are removed and the turbulence energy (k) close to an actual value can be obtained. Accordingly, an estimated value of the pressure distribution close to an experimental value can be obtained even in an area of a butting flow, a normal pressure gradient flow and an inverse pressure gradient flow.
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