Apparatus for and method of simulating turbulence

Title: Apparatus for and method of simulating turbulence

Abstract

In accordance with a preferred embodiment of the invention, a novel apparatus for and method of simulating physical processes such as fluid flow is provided. Fluid flow near a boundary or wall of an object is represented by a collection of vortex sheet layers. The layers are composed of a grid or mesh of one or more geometrically shaped space filling elements. In the preferred embodiment, the space filling elements take on a triangular shape. An Eulerian approach is employed for the vortex sheets, where a finite-volume scheme is used on the prismatic grid formed by the vortex sheet layers. A Lagrangian approach is employed for the vortical elements (e.g., vortex tubes or filaments) found in the remainder of the flow domain. To reduce the computational time, a hairpin removal scheme is employed to reduce the number of vortex filaments, and a Fast Multipole Method (FMM), preferably implemented using parallel processing techniques, reduces the computation of the velocity field.

Inventors:

Dimas, Athanassios ^[1]; Lottati, Isaac ^[2]; Bernard, Peter ^[3]; Collins, James ^[4]; Geiger, James C ^[1]

Rockville, MD
Potomac, MD
Silver Spring, MD
Sykesville, MD

Issue Date:: 2003-01-01

Research Org.:: Krispin Technologies, Inc., Rockville, MD (United States)

OSTI Identifier:: 875014

Patent Number(s):: 6512999

Assignee:: Vorcat, Inc. (Rockville, MD)

DOE Contract Number:: FG02-97ER82413

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: apparatus; method; simulating; turbulence; embodiment; novel; physical; processes; fluid; flow; provided; near; boundary; wall; represented; collection; vortex; sheet; layers; composed; grid; mesh; geometrically; shaped; space; filling; elements; triangular; shape; eulerian; approach; employed; sheets; finite-volume; scheme; prismatic; formed; lagrangian; vortical; tubes; filaments; found; remainder; domain; reduce; computational; time; hairpin; removal; fast; multipole; fmm; implemented; parallel; processing; techniques; reduces; computation; velocity; field; fluid flow; /703/

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                    Dimas, Athanassios, Lottati, Isaac, Bernard, Peter, Collins, James, and Geiger, James C. Apparatus for and method of simulating turbulence.  United States: N. p., 2003. 
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                    Dimas, Athanassios, Lottati, Isaac, Bernard, Peter, Collins, James, & Geiger, James C. Apparatus for and method of simulating turbulence.  United States.

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                    Dimas, Athanassios, Lottati, Isaac, Bernard, Peter, Collins, James, and Geiger, James C. Wed .  
        "Apparatus for and method of simulating turbulence".  United States.  https://www.osti.gov/servlets/purl/875014.

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@article{osti_875014,

  title        = {Apparatus for and method of simulating turbulence},

  author       = {Dimas, Athanassios and Lottati, Isaac and Bernard, Peter and Collins, James and Geiger, James C},

  abstractNote = {In accordance with a preferred embodiment of the invention, a novel apparatus for and method of simulating physical processes such as fluid flow is provided. Fluid flow near a boundary or wall of an object is represented by a collection of vortex sheet layers. The layers are composed of a grid or mesh of one or more geometrically shaped space filling elements. In the preferred embodiment, the space filling elements take on a triangular shape. An Eulerian approach is employed for the vortex sheets, where a finite-volume scheme is used on the prismatic grid formed by the vortex sheet layers. A Lagrangian approach is employed for the vortical elements (e.g., vortex tubes or filaments) found in the remainder of the flow domain. To reduce the computational time, a hairpin removal scheme is employed to reduce the number of vortex filaments, and a Fast Multipole Method (FMM), preferably implemented using parallel processing techniques, reduces the computation of the velocity field.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2003},

  month        = {1}

}

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Works referenced in this record:

Tracking and visualizing turbulent 3D features
journal, January 1997

Silver, D.
IEEE Transactions on Visualization and Computer Graphics, Vol. 3, Issue 2
DOI: 10.1109/2945.597796

Vortex tubes in turbulent flows: identification, representation, reconstruction
conference, January 1994

Banks, D. C.; Singer, B. A.
Proceedings Visualization '94
DOI: 10.1109/VISUAL.1994.346327

A predictor-corrector technique for visualizing unsteady flow
journal, June 1995

Banks, D. C.; Singer, B. A.
IEEE Transactions on Visualization and Computer Graphics, Vol. 1, Issue 2
DOI: 10.1109/2945.468404

Tracking a turbulent spot in an immersive environment
conference, January 1995

Banks, David C.; Kelley, Michael
Proceedings of the 1995 symposium on Interactive 3D graphics - SI3D '95
DOI: 10.1145/199404.199434

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Title: Apparatus for and method of simulating turbulence

Abstract

Citation Formats

Tracking and visualizing turbulent 3D features journal, January 1997

Vortex tubes in turbulent flows: identification, representation, reconstruction conference, January 1994

A predictor-corrector technique for visualizing unsteady flow journal, June 1995

Tracking a turbulent spot in an immersive environment conference, January 1995

Tracking and visualizing turbulent 3D features
journal, January 1997

Vortex tubes in turbulent flows: identification, representation, reconstruction
conference, January 1994

A predictor-corrector technique for visualizing unsteady flow
journal, June 1995

Tracking a turbulent spot in an immersive environment
conference, January 1995