Computational Study of Multiple Body Scattering Using High-Order Overset Grid Method

Sherer, Scott E.; Visbal, Miguel R.

doi:10.2514/6.2003-3203

Cited by 17 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In such a configuration, acoustic production and diffraction phenomena only take place in the curvilinear domain and the Cartesian grid computation has just to propagate the acoustic waves. This one-way coupling method by grid overlap can be seen as a particular boundary condition treatment for the Cartesian mesh [22]. Because of possible numerical reflections, the curvilinear mesh cannot end at the coupling boundary.…”

Section: Description Of the Coupling Methodsmentioning

confidence: 99%

“…In each direction, the number of points must be at least max((n d À 1)/2, (n f À 1)/2) with n d the stencil width of the spatial derivative scheme and n f the stencil of the discrete filter -n d and n f being odd numbers. Before defining the interpolation method, one notice that, on the contrary of most overlapped or overset grid methods [11,22], the Cartesian points inside the coupling boundary that do not play the role of ghost points are not discarded here. This step is usually called ''hole cutting process'' and the purpose is to ''remove'' the points where the flow has not physical sense.…”

Section: Description Of the Coupling Methodsmentioning

confidence: 99%

See 1 more Smart Citation

On the use of a high order overlapping grid method for coupling in CFD/CAA

Desquesnes

Terracol

Manoha

et al. 2006

Journal of Computational Physics

View full text Add to dashboard Cite

Section: Description Of the Coupling Methodsmentioning

confidence: 99%

Section: Description Of the Coupling Methodsmentioning

confidence: 99%

On the use of a high order overlapping grid method for coupling in CFD/CAA

Desquesnes

Terracol

Manoha

et al. 2006

Journal of Computational Physics

View full text Add to dashboard Cite

“…However, this approach is unacceptable when using a domain-decomposition approach to provide parallel-processing capability due to the appearance of computational boundaries in areas of the domain that would not otherwise be refined. The technique of employing one-sided, high-order filters near boundaries was proven effective for 460 S. E. SHERER AND M. R. VISBAL maintaining solution integrity in various multiple-grid problems [3,15,23] and will be used here. The formulations for the various orders-of-accuracy of the one-sided, Padé-type filters are also given in [15] as a function of f .…”

Section: Filtering Formulasmentioning

confidence: 99%

Multi‐resolution implicit large eddy simulations using a high‐order overset‐grid approach

Sherer

Visbal

2007

Numerical Methods in Fluids

View full text Add to dashboard Cite

SUMMARYA parallel, high-order, overset-grid method is validated for use in large eddy simulation (LES) through its application to fundamental turbulent flow problems. The current method employs a high-order, compact finite-difference approach to evaluate spatial derivatives, with up to tenth-order low-pass filters used to remove high-frequency spurious wave content. These filters have also been found to be effective in modelling the dissipation that occurs at the unresolved scales in the flow for LES simulations. Temporal integration is based on an implicit, approximately factored and diagonalized, second-order algorithm, which reduces the time-step constraints present in explicit time-marching methods for wall-bounded viscous flows. Parallelization, geometric complexity, and local grid refinement are all addressed through the use of an overset-grid approach, with grid communication provided by high-order Lagrangian interpolation. The problems investigated in this work include fully turbulent channel flow at Re = 590 and 1017, and the transitional wake generated by flow over a single circular cylinder at Re D = 3900. The results obtained with the current approach are validated against well-resolved benchmark calculations or experiments and the impact of the order-of-accuracy of the interpolation method is investigated. The benefits obtained by using the general overset-grid technique to reduce grid point requirements compared to single-grid simulations are also examined. It is shown that for the problems considered in this work, substantial grid-point savings may be obtained with an overset-grid approach compared to a single-grid approach, and that the use of high-order interpolation at overset boundaries is important in maintaining overall solution accuracy.

show abstract

“…24 All distances are rendered nondimensional by the larger cylinder's diameter D. The smaller cylinder's diameter is half that of the larger, and the separation between the two cylinders is 8D. The sound source is a noncompact monopole located half-way between the two cylinders, whose expression is given by…”

Section: Diffraction By Two Cylindersmentioning

confidence: 99%

High-Order Curvilinear Simulations of Flows Around Non-Cartesian Bodies

2005

View full text Add to dashboard Cite

The current work describes the application of high-order numerical techniques to single or multiple overset curvilinear body-fitted grids, demonstrating the feasibility of direct computations of noise radiated by flows around complex non-Cartesian bodies. Flows of both physical and industrial interest can be investigated with this approach. We first rapidly describe the numerical techniques implemented in our curvilinear simulations. The explicit high-order differencing and filtering schemes are presented, as well as their application to the curvilinear Navier-Stokes equations. We then present brief results of various 2-D acoustic simulations. First the flow around a cylinder, and the associated acoustic field, are described. The diameter-based Reynolds number Re D = 150 is under the critical Reynolds number of the onset of 3-D phenomena in the vortex-shedding. Simulation results can thus be meaningfully compared to experimental measurements. A case of acoustic scattering is then examined. A non-compact monopolar source is placed half way between two differently sized cylinders. A complex diffraction pattern is created, and resulting RMS pressure data are compared to the analytical solution. Finally the noise generated by a low Reynolds number laminar flow around a NACA 0012 airfoil is presented.

show abstract

Computational Study of Multiple Body Scattering Using High-Order Overset Grid Method

Cited by 17 publications

References 0 publications

On the use of a high order overlapping grid method for coupling in CFD/CAA

On the use of a high order overlapping grid method for coupling in CFD/CAA

Multi‐resolution implicit large eddy simulations using a high‐order overset‐grid approach

High-Order Curvilinear Simulations of Flows Around Non-Cartesian Bodies

Contact Info

Product

Resources

About