An Evaluation Method on Flow Visualization via LES-Vehicle Underbody Flow Field-

A B S T R A C T E v a l u a t i o n s of the a e r o d y n a m i c pe r fo rmances of veh ic le bodies i n ea r l y veh ic le des ign stage w i thou t , t he e x p e r i m e n t are p r a c t i c a l l y i m p o r t a n t . T h i s paper descr ibes an eva l u a t i o n me thod of t he L E S so lu t ions for comp lex geomet r i ca l c o n f i g u r a t i o n w i t h some examp les app l i ed to the LES-based v i s u a l i z e d flow f i e l d a r o u n d a veh ic le w i t h semi -complex u n d e r b o d y con f i gu ra t i on . The e v a l u a t i o n m e t h o d is composed of 4 stages, i . e . , 1 ) c h e c k i n g g r i d dependency, 2) check ing the energy s p e c t r u m of so lu t ions , 3) compa r i sons to p rev ious exper iences, 4) e x p l a n a t i o n s of the ca l cu la ted v i s u a l i z e d resu l t s .