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CFD project combining solution algorithms, software development/validation, and viscous flow calculations

Computer Applications in engineering Education 1998年第3期5卷

作者： W. R. Briley B. K. Hodge Department of Mechanical Engineering and NSF Engineering Research Center for Computational Field Simulation Mississippi State University Mississippi State Mississippi 39762-5925 Department of Mechanical Engineering Mississippi State University Mississippi State Mississippi 39762-5925

This project integrates lecture material on computational methodology for viscous flows with hands-on exposure to code development, validation, and case running, all in a context suitable for varying programming skills. Students are given a well-documented, partially completed code for solving the boundary-layer equations. They recreate the missing parts in accordance with material covered in lectures and then compute laminar and turbulent flows. Examples of results are given. © 1997 John Wiley & Sons, Inc. Comput Appl Eng Educ 5: 161–168, 1997

关键词： fluid dynamics viscous flow computational methodology solution algorithms software development/validation boundary-layer equations

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Interactive exhibit for the Smithsonian Institution's How Things Fly gallery

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Computer Applications in engineering Education 1998年第1期5卷

作者： D. H. Huddleston M. L. Stokes J. D. Anderson S. Soter Civil Engineering Department Mississippi State University P.O. Box 9546 Mississippi State MS 39762 NSF Engineering Research Center for Computational Field Simulation Mississippi State University Mississippi State MS 39762 Department of Aerospace Engineering University of Maryland MD National Air and Space Museum Smithsonian Institution Washington DC

Development of an interactive display for the Smithsonian Institution's How Things Fly gallery illustrating fundamental aerodynamic principles associated with flight is described. Results from Reynolds-average Navier-Stokes simulations of various airfoil geometries and flight conditions are presented in a graphics-based interactive display implemented on an Intel 486/Pentium-class personal computer. This interactive display is one mechanism used to demonstrate basic aerodynamic principles to museum visitors in this new gallery within the National Air and Space Museum. © 1997 John Wiley & Sons, Inc. Comput. Appl Eng Educ 5: 13–20, 1997

关键词： graphics-based interaction aerodynamics

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Solution adaptive unstructured grid generation using pseudo-pattern recognition techniques 13th

Solution adaptive unstructured grid generation using pseudo-...

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13th computational Fluid Dynamics Conference, 1997

作者： Marcum, David L. Gaither, Kelly P. NSF Engineering Research Center for Computational Field Simulation Mississippi State University United States

A procedure is presented for anisotropic adaptation of inviscid type flow features with CFD simulation using an unstructured grid. The basic grid generation scheme is an existing advancing-front, local-reconnection (AFLR) procedure. This procedure is modified to allow the field point spacing and alignment to vary based on a flow field solution using adaptive grid regeneration. Multiple physically based feature detectors are used to isolate regions in the field which contain physical features of interest. Using pattern recognition techniques, these regions are reduced to groups of simple geometric entities representing the physical features. Features such as expansion or stagnation regions are reduced to singular points. Shock waves and contact discontinuities are reduced to curves. In the adaptive grid regeneration procedure, singular points are treated as adaptive sources which modify the boundary and field point spacing. Curves are treated as embedded boundaries. These embedded dual-sided boundaries provide a framework for generating aligned high-aspectnratio elements. A description of the procedure is presented along with results for two-dimensional applications with multiple features. The results clearly demonstrate the capability of the overall procedure for CFD applications. And, they indicate that the method can be further developed into a robust and useful procedure. © 1997, American Institute of Aeronautics and Astronautics, Inc.

关键词： Shock waves

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Detection and controlled manipulation of coherent structures in medical images

Detection and controlled manipulation of coherent structures...

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Southern Biomedical engineering Conference

作者： R. Machiraju R. Vickery Department of Computer Science NSF Engineering Research Center for Computational Field Simulation MS USA

Much information in an image is concentrated in a few regions. These are dominated by structures characterized by discontinuities in color intensity. We present a wavelet based image analysis algorithm that identifies features that persist across the scales of the wavelet decomposition. This is achieved through the notion of sub-band combining which we introduce here. We first decompose the image into scales using the wavelet transform. Then, for each pixel, the combining process computes a function that collects all the information available at the sub-band (detail) scales. The result is a mask image indicating the significance of every point. Additional processing and image enhancement can now concentrate their efforts in regions where the masks show high values. Medical images, which are band-limited and contain no illumination artifacts, are especially suited to take advantage of sub-band combining. We show how our method can be employed to remove noise, enhance, and smooth features in images from MRI and mammography. Also, we allude to the use of this method to the creation of scale maps for level-of-detail computations.

关键词： Biomedical imaging Wavelet transforms Image edge detection Wavelet analysis Image color analysis Shape Computer science Biomedical engineering computational modeling Computer simulation

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Instructional software for visualizing optical phenomena

Instructional software for visualizing optical phenomena

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IEEE Conference on Visualization

作者： D.C. Banks J.T. Foley K.N. Vidimce Ming-Hoe Kiu NSF Engineering Research Center for Computational Field Simulation USA Department of Physics and Astronomy Mississippi State University USA

We describe a multidisciplinary effort for creating interactive 3D graphical modules for visualizing optical phenomena. These modules are designed for use in an upper-level undergraduate course. The modules are developed in Open Inventor, which allows them to run under both Unix and Windows. The work is significant in that it applies contemporary interactive 3D visualization techniques to instructional courseware, which represents a considerable advance compared to the current state of the practice.

关键词： Visualization Optical filters Physics Computer graphics Educational institutions Optical design Stimulated emission Laboratories Optical computing Education

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A comparison of normal estimation schemes 97

A comparison of normal estimation schemes

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Proceedings of the 8th conference on Visualization '97

作者： Torsten Möller Raghu Machiraju Klaus Mueller Roni Yagel Department of Computer and Information Science and The Advanced Computing Center for the Arts and Design The Ohio State University Columbus Ohio NSF Engineering Research Center for Computational Field Simulation and Department of Computer Science Mississippi State University Mississippi Department of Computer and Information Science The Ohio State University Columbus Ohio

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A NURBS Based Grid Generation Technique for a Temporally Deforming Geometry

A NURBS Based Grid Generation Technique for a Temporally Def...

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ASME 1996 International Mechanical engineering Congress and Exposition, IMECE 1996

作者： Clutter, Edward G. NSF Engineering Research Center for Computational Field Simulation Mississippi State University Mississippi StateMS United States

ISBN: (纸本)9780791815403

When conducting a computational field simulation of fluid flow for a biological application, such as blood flow through a vein, the results obtained will more accurately represent the physics involved if the interaction of wall mechanics and blood flow can be taken into account. However the CPU time required to generate a new numerical grid at each time step quickly becomes too costly to be feasible for most real applications involving complex geometries. If this obstacle is to be overcome, a grid generation technique which can produce a grid in a timely fashion, while maintaining an accurate representation of the boundary m is currently deformed shape, must be devised. It is with this goal in mind that the following grid generation technique has been developed. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Blood

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Application of a factored newton-relaxation scheme to calculation of discrete aerodynamic sensitivity derivatives*

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Inverse problems in engineering 1996年第1-3期3卷 115-130页

作者： B.K. Soni D.H. Huddleston [a] Engineering Research Center for Computational Field Simulation (an NSF Engineering Research Center) Mississippi State University Mississippi State MS

The objective of this paper is to describe the modifications and extensions required to apply an existing Euler solver to the calculation of discrete aerodynamic sensitivity derivatives and to evaluate the perfomance of a Newton-relaxation scheme as applied to the very large sparse systems of equations resulting from aerodynamics sensitivity analysis. The preponderance of prior work has utilized direct methods to solve these linear equations resulting in techniques requiring large amounts of computer memory making application to complex 2D or 3D configurations difficult, if not impractical.

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The application of wavelets to lossless compression and progressive transmission of floating point data in 3-D curvilinear grids

The application of wavelets to lossless compression and prog...

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Data Compression Conference (DCC)

作者： A. Trott R. Moorhead J. McGinley NSF Engineering Research Center for Computational Field Simulation Mississippi State University MS USA

Many times in computational fluid dynamics (CFD) work very large datasets are produced on remote machines. This vast amount of data must often be moved to a local machine for post processing and visualization. However, this can be time consuming because of the large quantity of data that must be transmitted. Compressing the data can speed up the transmission and save several hours of the researchers' time. Progressive transmission can further increase efficiency of the visualization process by giving researchers an approximation of the data very quickly. They can then make a decision based on this approximation about whether to continue the transmission or, if the data is determined to be undesirable, to abort it. A method of lossless compression using wavelets is presented that enables progressive transmission of CFD data in Plot-3D format, a standard format for CFD data. Given a CFD data set, the floating point data is first converted to double-precision floating point format. Although the conversion to double-precision floating point numbers doubles the size of the data set, most of the extra precision retains the value of zero. It can therefore be compressed very well using Huffman codes.

关键词： Propagation losses computational fluid dynamics Data visualization Legged locomotion Data engineering Grid computing computational modeling Huffman coding

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Hector: automated task allocation for MPI

Hector: automated task allocation for MPI

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International Symposium on Parallel Processing

作者： S.H. Russ B. Flachs J. Robinson B. Heckel NSF Engineering Research Center for Computational Field Simulation Mississippi State University MS USA

Many institutions already have networks of workstations, which could potentially be harnessed as a powerful parallel processing resource. A new, automatic task allocation system has been built on top of MPI, an environment that permits parallel programming by using the message-passing paradigm and implemented in extensions to C and FORTRAN. This system, known as "Hector", supports dynamic migration of tasks and automatic run-time performance optimization. MPI programs can be run without modification under Hector and can be run on existing networks of workstations. Thus Hector permits institutions to harness existing computational resources quickly and transparently.

关键词： Workstations Parallel processing Parallel programming Runtime Optimization

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