Efficient Formulations for Quasi-Steady Processes Simulations:Multi-Mesh Method,Arbitrary Lagrangian or Eulerian Formulation and Free Surface Algorithms
Numerical simulation of forming processes like rolling may require prohibitive computational times.Calculations can be speeded-up by different recently developed numerical methods.If the process can be considered as steady,then the steady-state can be directly computed using an iterative approach based on free surface corrections: the domain shape is computed alternately with the resolution of mechanical equations.In the frame of 3D unstructured meshes,complex shapes and parallel calculations,it is proposed to use a global formulation based on a least square functional with an upwind shift for taking into account contact conditions.It is shown to converge from any initial shape of the domain.If the process is only quasi-steady,then the computational cost can be reduced by considering a smaller part of the domain,which is made possible by an Arbitrary Eulerian or Lagrangian formulation.A general formulation is developed,which applies to a wide range of forming processes.In rolling,the observed computational cost reduction varies between 2 and 7 in parallel.If an incremental Lagrangian approach is inescapable,then the multi-mesh method makes it possible to reduce the computational cost by using several meshes on the same domain.Each mesh is optimal for a particular physic of the domain.This approach provides speed-ups up to 10 in a parallel computing environment.
Rolling Drawing Steady-state Stationary Processes ALE Formulation Multi-mesh Method Free Surface Algorithm Parallel Computations Meshing Remeshing
Lionel FOURMENT Sylvain GAVOILLE Ugo RIPERT Koffi KPODZO
MINES Paris Tech-CEMEF,CS 10207,1 rue Claude Daunesse,06 904 Sophia Antipolis Cedex,FRANCE
国际会议
沈阳
英文
291-297
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）