🚀 go-pugleaf

Re: Steady-state incompressible flow calculations using a finite volume code


    We are currently trying to obtain numerical solutions for two-
    dimensional incompressible steady-state flow problems. The code we use 
    is standard (finite volume method, Cartesian coordinates, staggered grid
    arrangement, SIMPLE type solution algorithm) and works pretty well for 
    compressible flow. Steady solutions are obtained as the limit of an 
    unsteady approach.
    However, when turning to incompressible flows, we are confronted with 
    serious convergence problems. The omission of the compressibility term 
    in the pressure correction equation makes this equation sensitive and 
    prone to overshooting (loss of diagonal dominance). We have been 
    experimenting with various damping techniques (underrelaxation, inertia)
    and a wide range of time steps without much success. 
    Our goal is reaching the steady state solution with a minimum of total 
    iterations (iterations per time step * number of steps). We would be 
    grateful to receive 

      - hints on tricks to employ in this situation

      - literature quotations concerning the topic "computation of 
        incompressible flow fields"

        Peter Blahowsky TU Graz Austria  jrp@fmechsg01.tu-graz.ac.at