Recent enhancements to OVERFLOW

Jespersen, Dennis C.; Pulliam, Thomas H.; Buning, Pieter G.

doi:10.2514/6.1997-644

Cited by 221 publications

(103 citation statements)

References 14 publications

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“…The main section of the pipe is a cylinder with radius equal to 1 and axis of symmetry given by the x 1 -axis. At the base level, it is represented by the union of a box grid defined previously in (20) and a boundary-fitted cylindrical grid. The latter grid is defined by and then rotate this latter two-grid configuration by 90 • about the x 3 -axis.…”

Section: Detonation Initiation In a T-shaped Pipementioning

confidence: 99%

“…Other pioneering work includes that of Starius [6][7][8], Kreiss [9], and Steger et al [10] who referred to the approach as Chimera grids. Since this early work, the overlapping grid technique has been used successfully to solve a wide variety of problems in high-speed reactive flow [2,3,11], reactive and non-reactive multi-material flow [12,13], combustion [14], aerodynamics [15][16][17][18][19][20][21], blood flow [22], flows around ships [23], visco-elastic flows [24], and flows with deforming boundaries [25][26][27], among others. The use of AMR in combination with overlapping grids was considered by Brislawn et al [28], Boden and Toro [29], Meakin [21], Henshaw and Schwendeman [2,3], and Banks et al [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Parallel computation of three-dimensional flows using overlapping grids with adaptive mesh refinement

Henshaw¹,

Schwendeman²

2008

Journal of Computational Physics

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This paper describes an approach for the numerical solution of time-dependent partial differential equations in complex three-dimensional domains. The domains are represented by overlapping structured grids, and block-structured adaptive mesh refinement (AMR) is employed to locally increase the grid resolution. In addition, the numerical method is implemented on parallel distributed-memory computers using a domain-decomposition approach. The implementation is flexible so that each base grid within the overlapping grid structure and its associated refinement grids can be independently partitioned over a chosen set of processors. A modified bin-packing algorithm is used to specify the partition for each grid so that the computational work is evenly distributed amongst the processors. All components of the AMR algorithm such as error estimation, regridding, and interpolation are performed in parallel.The parallel time-stepping algorithm is illustrated for initial-boundary-value problems involving a linear advectiondiffusion equation and the (nonlinear) reactive Euler equations. Numerical results are presented for both equations to demonstrate the accuracy and correctness of the parallel approach. Exact solutions of the advection-diffusion equation are constructed, and these are used to check the corresponding numerical solutions for a variety of tests involving different overlapping grids, different numbers of refinement levels and refinement ratios, and different numbers of processors. The problem of planar shock diffraction by a sphere is considered as an illustration of the numerical approach for the Euler equations, and a problem involving the initiation of a detonation from a hot spot in a T-shaped pipe is considered to demonstrate the numerical approach for the reactive case. For both problems, the solutions are shown to be well resolved on the finest grid. The parallel performance of the approach is examined in detail for the shock diffraction problem.

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Section: Detonation Initiation In a T-shaped Pipementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parallel computation of three-dimensional flows using overlapping grids with adaptive mesh refinement

Henshaw¹,

Schwendeman²

2008

Journal of Computational Physics

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“…This utilization of a steady-state algorithm is significant because it allows the application of low-Mach preconditioning to the governing equations for improved convergence and solution quality at low Mach numbers [12]. For the highest wind speed used in this study at 10 m/s, the resulting Mach number is just less than 0.03.…”

Section: Flow Solver and Grid Generationmentioning

confidence: 98%

“…The rate of convergence to a solution is generally governed by q . This is the rate at which disturbances are propagated out of the computational domain [12].…”

Section: Flow Solver and Grid Generationmentioning

confidence: 99%

CFD analysis of rotating two-bladed flatback wind turbine rotor.

Dam

Chao²,

Berg

2008

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The effects of modifying the inboard portion of the NREL Phase VI rotor using a thickened, flatback version of the S809 design airfoil are studied using a threedimensional Reynolds-averaged Navier-Stokes method. A motivation for using such a thicker airfoil design coupled with a blunt trailing edge is to alleviate structural constraints while reducing blade weight and maintaining the power performance of the rotor. The calculated results for the baseline Phase VI rotor are benchmarked against wind tunnel results obtained at 10, 7, and 5 meters per second. The calculated results for the modified rotor are compared against those of the baseline rotor. The results of this study demonstrate that a thick, flatback blade profile is viable as a bridge to connect structural requirements with aerodynamic performance in designing future wind turbine rotors.3

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“…Recent developments in rreneral purpose CFD methods include COMPGRID and the OVERTURE system (Brislawn, et ul., 1996j, developed at LANL. and OVERFLOWS (Jespersen, et al, 1997), developed at NASA-Ames.…”

Section: -8mentioning

confidence: 99%

Survey and discussion of models applicable to the transport and fate thrust area of the Department of Energy Chemical and Biological Nonproliferation Program

Shuler¹

1997

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Recent enhancements to OVERFLOW

Cited by 221 publications

References 14 publications

Parallel computation of three-dimensional flows using overlapping grids with adaptive mesh refinement

Parallel computation of three-dimensional flows using overlapping grids with adaptive mesh refinement

CFD analysis of rotating two-bladed flatback wind turbine rotor.

Survey and discussion of models applicable to the transport and fate thrust area of the Department of Energy Chemical and Biological Nonproliferation Program

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