DEVELOPMENT OF A PARALLEL DIRECT SIMULATION CODE TO INVESTIGATE REACTIVE FLOWS

Solving the Navier-Stokes equations with detailed modeling of the tran sport and reaction terms remains at the present time a very difficult challenge. Direct simulations of two-dimensional reactive hows using a ccurate models for the chemical reactions generally require days of co mputing time on today's most powerful serial vector supercomputers. Up to now, realistic three-dimensional simulations remain practically im possible. Working with parallel computers seems to be at the present t ime the only possible solution to investigate more complicated problem s at acceptable costs, however, lack of standards on parallel architec tures constitutes a real obstacle. In this paper, we describe the stru cture of a parallel two-dimensional direct simulation code using detai led transport, thermodynamic and reaction models. Separating the modul es controlling the parallel work from the flow solver, it is possible to get a high compatibility degree between parallel computers using di stributed memory and message-passing communication. A dynamic load-bal ancing procedure is implemented in order to optimize the distribution of the load among the different nodes. Efficiencies obtained with this code on many different architectures are given. First examples of app lication conceding the interaction between vortices and a diffusion fl ame are shown in order to illustrate the possibilities of the solver. Copyright (C) 1996 Elsevier Science Ltd.