Author/Authors :
Jin, W State Key Laboratory of High Performance Computing - College of Computer - National University of Defense Technology, Changsha, China , Xu, X State Key Laboratory of High Performance Computing - College of Computer - National University of Defense Technology, Changsha, China , Tang, Y State Key Laboratory of High Performance Computing - College of Computer - National University of Defense Technology, Changsha, China , Zhou, H College of Aerospace Science and Engineering - National University of Defense Technology, Changsha , China , Zhou, H State Key Laboratory of High Performance Computing - College of Computer - National University of Defense Technology, Changsha, China , Ren, X State Key Laboratory of High Performance Computing - College of Computer - National University of Defense Technology, Changsha, China
Abstract :
The coefficient adaptation problem is often encountered in CFD simulations. The accuracy of simulation
results depends much on the empirical coefficients of mathematical models. Cavitation simulation is a typical
application of CFD. Researchers have proposed methods to optimize the empirical coefficients of the
cavitation model. However, these methods can only acquire constant values which aren’t adaptive to all the
operating conditions. This paper focused on the condensation and the evaporation coefficients of the Zwart
model and considered quasi-steady cavitating flows around a 2-D NACA66(MOD) hydrofoil. For the first
time, we gave a formal description of the coefficient adaptation problem, and put forward a method to model
the relationship between the best coefficient values and the operating conditions. We designed and
implemented the coefficient adaptation platform combining OpenFOAM, and validated the best coefficient
values predicted by our method. The overall results show the predicted coefficient values result in an increase
of accuracy by 12% in average, compared with the default values and the tuned values by Morgut, thus
indicating our method can effectively solve the coefficient adaptation problem for the Zwart model. We
believe the proposed method can be extended to other mathematical models in practical uses.
Keywords :
CFD , Cavitation , OpenFOAM , Zwart model , Coefficient optimization
