Development And Demonstration Of Parallel Computing Platform For Viscoelastic Fluid Based On Marruccian Model

With the development of high performance computing technology and Computational Fluid Dynamics, numerical simulation is as important as experiment in viscoelastic fluid research. Nowadays, viscoelastic fluid simulation has been widely used in physics, chemistry, lift science, new material and bio-medicine. However, the development of parallel computing platform for viscoelastic fluid is still of great difficulty. On one hand, the viscoelastic constitutive theory is far from mature and lots of phenomenons in experiments can not be reproduced by simulation. On the other hand, viscoelastic specialists can hardly develop efficient parallel applications on the high performance computing system for the lack of compatible parallel application framework. So, the investigation of viscoelastic fluid constitutive theory and the development of viscoelastic fluid simulation parallel platform for specialists are of great significance to our country. Based on Marruccian model, a viscoelastic fluid oriented parallel simulation platform is developed in this paper, by extending the open source package Open FOAM. The major work and innovations of this thesis are listed here:After an introduction to related background and base knowledge, the basic procedure of viscoelastic fluid simulation is summarized. The paper especially analysed the fluid control equation and constitutive equation. With the help of Matlab, the constitutive curve was simulated under pure shear rheological flow, which provided an deep insight into Marruccian model. By summarizing the requirement of viscoelastic simulation, we come to the demand of the platform: good experience in interactive configuration, various of numerical discrete method, stable numerical solution, acquisition and analysis of viscoelastic fluid featured data.To meet these requirements, the Marruccian based viscoelastic fluid parallel simulation platform M-RHEO is established by extending the open source package Open FOAM.Then, the paper analysed the organization and data structure. The framework of the whole system of M-RHEO is designed by adding the extended functions to Open FOAM. The details of the implement of four extended parts were provided, including finite element discrete method, boundary correction, featured date acquisition and Marruccian model solver.At last, as the classic benchmark problems, contraction and flow past cylinder were chosen to test the M-RHEO. The tests included grids generation, solver test, data acquisition. In the simulation of contraction, the asymmetric and oscillated flow were obtained.Then the effects of increasing Weissenberg number to the flow had been analysed. In the simulation of flow past cylinder, the Von Karman vortex streets phenomenon was obtained. And effects of the parameter of polymer brought to the flow was especially discussed. The simulation results revealed that M-RHEO could get receivable results and capable for viscoelastic flow simulation.