Using the V-Sphere Code for the Passive Scalar in the Wake of a Bluff Body

The objective of this research was to find the diffusion properties of vehicles on the road by using the V-Sphere Code. The diffusion coefficient and the size of the height of the wake were estimated with the LES option and the third order MUSCL scheme. We evaluated the code with the changes in the moments of Reynolds Stress along the mean streamline. The results show that at the leading part of a bluff body the LES has some advantages over the RNS since the changes in the strain rates are larger for the leading part. We estimated that the diffusion coefficient with the computed Reynolds stress (non-dimensional) was about 0.96 times the mean velocity.

• Y. Obikane
• T. Nemoto
• K. Ogura
• M. Iwata
• K. Ono

• Wake
• bluff body
• V-CAD
• turbulence diffusion.

[1] Y.Obikane,Numerical Computation of Turbulent Flow Around the
Spinner of a Turbofan Engine , in proceedings, the 13th International
Symposium on Air Breathing Engine, 1984
[2] K.Ono and T.Tamaki, Development of a framework for parallel
simulators with various physics and its performance, IN proceeding,
International conference on parallel computational fluid dynamics,
Antarya, Turkey, 2007,may, Parallel CFD Introduction to Signal
Detection and Estimation. New York: Springer-Verlag, 1985, ch. 4.