Three-dimensional unsteady incompressible flow computations using multigrid

Andrey Belov, Luigi Martinelli, Antony Jameson

Research output: Contribution to conferencePaper

4 Scopus citations

Abstract

We apply a robust and computationally efficient multigrid-driven algorithm for the simulation of time-dependent three-dimensional incompressible bluff body wakes at low Reynolds numbers (Re less than or equal to 350). The computational algorithm combines a generalized time-accurate artificial compressibility approach, a finite-volume discretization in space, and an implicit backward discretization in time. The solution is advanced in time by performing iterative ‘pseudo-transient’ steady-state calculations at each time step. The key to the algorithm’s efficiency is a powerful multigrid scheme that is employed to accelerate the rate of convergence of the pseudo-transient iteration. The computational efficiency is improved even further by the application of residual smoothing and local pseudo time-stepping techniques, and by using a point-implicit discretization of the unsteady terms. The solver is implemented on a multiprocessor IBM SP2 computer by using the MPI Standard, and a high parallel scalability is demonstrated. The low Reynolds number regime (Re less than or equal to 500) encompasses flow transitions to unsteadiness and to three-dimensionality and attracts considerable attention as an important step on the road to turbulence. In this regime, the slow asymptotics of the wake provide a challenging test for numerical methods since long integration times are necessary to resolve the flow evolution toward a limiting cycle. Our method is extended to three dimensions and applied for low Reynolds number flows over a circular cylinder (Re less than or equal to 250) and a circular semi-cylinder (Re = 350). The computational results are found to be in close agreement with the available experimental and computational data.

Original languageEnglish (US)
StatePublished - Jan 1 1997
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: Jan 6 1997Jan 9 1997

Other

Other35th Aerospace Sciences Meeting and Exhibit, 1997
CountryUnited States
CityReno
Period1/6/971/9/97

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    Belov, A., Martinelli, L., & Jameson, A. (1997). Three-dimensional unsteady incompressible flow computations using multigrid. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.