Exact(8)
A conditional semicoarsening multigrid algorithm is developed for the Poisson equation on stretched grids.
Both approaches yield large increases in convergence rates over cell-implicit smoothers on stretched grids.
Typically this is dealt with by means of stretched grids that concentrate resolution where needed (Avara et al. 2016; Sądowski 2016).
The resulting methods have been tested on four 2D laminar problems over a range of Reynolds numbers on both uniform and highly stretched grids.
To test the proposed algorithm, we consider two cases: 1) homogeneous isotropic turbulence discretized on uniform grids and 2) turbulent duct flow discretized on stretched grids.
Fourier analysis of the two-level p-multigrid algorithm for convection diffusion shows that element line Jacobi presents a significant improvement over element Jacobi especially for high Reynolds number flows and stretched grids.
Similar(52)
The computational domain is first discretized on a nonuniform (stretched) grid to resolve the boundary layers.
Under the MEXT/RECCA/SALSA project, the results of CHASER, along with the globally uniform and regionally stretched grid systems, were compared with the observations (SALSA [2014]).
Very recently, regional aerosol simulations that used the stretched grid system with a high spatial resolution of approximately 10 km were performed for the Kanto region of Japan under the MEXT/RECCA/SALSA project (SALSA [2014]; Goto et al. [2014]).
The optimal values of both time step and LU/AF parameter are determined for a test problem consisting of two-dimensional flow past a NACA 0012 airfoil, with a highly stretched grid.
This paper contains the first published numerical results of the behavior of two popular robust multigrid approaches (alternating-plane smoothers combined with standard coarsening and plane-implicit smoothers combined with semi-coarsening) for solving the 3-D incompressible Navier Stokes equations in the simulation of the driven-cavity and a boundary layer over a flat plate on a stretched grid.
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