Fluid-Rigid body interaction by PETSc-FEM driven by phyton

FILIPPINI GERMAN; DALCIN LISANDRO; NIGRO NORBERTO; STORTI MARIO

San Luis, Argentina

Congreso; ENIEF 2008; 2008

Universidad Nacional de San Luis

           Fluid structure interaction (FSI) involving rigid bodies contains three main problemsto be solved, the computational fluid dynamics (CFD), the computational mesh dynamics(CMD) and the multi-body dynamics (MBD). Python is used as a glue language capable ofconnecting this three main problems in a high-level, interactive and productive environment.This interaction is implemented in PETSc-FEM code (http://www.cimec.org.ar/petscfem)which is a parallel multi-physics finite element based on PETSc. PETSc is a suite of datastructures and routines for the scalable solution of scientific applications modeled by partialdifferential equations. It employs the MPI standard for all message-passing communication.PETSc for Python (petsc4py) are Python bindings for PETSc used in this work.A stabilized ALE (Arbitrary Lagrangian-Eulerian) formulation is used to solve theincompressible laminar Navier Stokes equations in a moving grid. The mesh dynamics maybe solved in general by a global optimization strategy, however, in some special cases, asimple ad-hoc procedure may be adopted. For each subproblems a second order accurate intime scheme is adopted. Results for vortex-induced vibrations (VIV), galloping and flutter ofsome numerical examples at low Reynolds number are presented.