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Author: Donald Baganoff
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 84
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Book Description
Author: Donald Baganoff
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 84
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Book Description
Author: Donald Baganoff
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
A limitation of the DSMC method is that it does not allow efficient use of vector architectures that are predominate in current supercomputers. A new selection rule for collisions between simulated molecules is developed which is highly compatible with vectorization. The collision-selection rule is shown to give identical results to the DSMC method in predicting shock-wave structure and in predicting the correct mean-free path variation with density and temperature for power-law interactions ranging from hard sphere to Maxwell molecule. Algorithmic improvements beyond those related to vectorization issues alone are also introduced, making possible simulations of single-species, rarefied, 3D hypersonic flows employing 10 million particles and 0.5 million cells. The performance of the algorithm on the Cray-2 ranges from 1 to 2 microseconds/particle/time-step. Roughly 500 to 1000 time-steps are needed to time average the results of a simulation, leading to run times of 2 to 5 hours on the Cray-2 for large problems. Keywords: Particle method; Rarefied flow; Direct simulation; Monte Carlo; Collision selection. (jhd).
Author:
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ISBN:
Category :
Languages : en
Pages : 0
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A particle code for simulating a rarefied hypersonic flow is developed which accounts for a multiple species gas in thermochemical nonequilibrium and which takes advantage of the parallel architecture of the Intel iPSC/860 supercomputer. Various tests were conducted using a generic blunt body consisting of a hemispherically blunted 60-degree half-angle cone at angle of attack. The different tests conducted show that the performance of the parallel code using 512 nodes exceeds by an order of magnitude the performance obtained for a highly vectorized code run on a single processor of the Cray YMP, that scaleup is found to be nearly linear with the number of processors used, that run time can be greatly reduced by employing a large number of particles, and that runs with 67.5 million particles can be carried out when employing the large memory of the Intel iPSC/860. Other results relate to different applications of the code for studying the near-continuum state of a gas near a cold solid boundary.
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781729025819
Category :
Languages : en
Pages : 30
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Book Description
A very efficient direct particle simulation algorithm for hypersonic rarefied flows is presented and its implmentation on a Connection Machine is described. The implementation simulates ideal diatomic Maxwell molecules with three translational and two rotational degrees of freedom. Results for a 2-D simulation of supersonic flow over a 30 deg wedge are presented and used for validation. Dagum, Leonardo Unspecified Center NCC2-387...
Author: D. C. Wadsworth
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Research Institute for Advanced Computer Science (U.S.)
Publisher:
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Category :
Languages : en
Pages :
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781724990631
Category :
Languages : en
Pages : 38
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The data parallel implementation of a particle simulation for hypersonic rarefied flow described by Dagum associates a single parallel data element with each particle in the simulation. The simulated space is divided into discrete regions called cells containing a variable and constantly changing number of particles. The implementation requires a global sort of the parallel data elements so as to arrange them in an order that allows immediate access to the information associated with cells in the simulation. Described here is a very fast algorithm for performing the necessary ranking of the parallel data elements. The performance of the new algorithm is compared with that of the microcoded instruction for ranking on the Connection Machine. Dagum, Leonardo Unspecified Center NASA-CR-188903, NAS 1.26:188903, RIACS-TR-89-44 AF-AFOSR-0139-88; NCC2-387; NAGW-965...
Author: Bertin
Publisher: Springer Science & Business Media
ISBN: 1461203716
Category : Science
Languages : en
Pages : 280
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Book Description
These three volumes entitled Advances in Hypersonics contain the Proceedings of the Second and Third Joint US/Europe Short Course in Hypersonics which took place in Colorado Springs and Aachen. The Second Course was organized at the US Air Force Academy, USA in January 1989 and the Third Course at Aachen, Germany in October 1990. The main idea of these Courses was to present to chemists, com puter scientists, engineers, experimentalists, mathematicians, and physicists state of the art lectures in scientific and technical dis ciplines including mathematical modeling, computational methods, and experimental measurements necessary to define the aerothermo dynamic environments for space vehicles such as the US Orbiter or the European Hermes flying at hypersonic speeds. The subjects can be grouped into the following areas: Phys ical environments, configuration requirements, propulsion systems (including airbreathing systems), experimental methods for external and internal flow, theoretical and numerical methods. Since hyper sonic flight requires highly integrated systems, the Short Courses not only aimed to give in-depth analysis of hypersonic research and technology but also tried to broaden the view of attendees to give them the ability to understand the complex problem of hypersonic flight. Most of the participants in the Short Courses prepared a docu ment based on their presentation for reproduction in the three vol umes. Some authors spent considerable time and energy going well beyond their oral presentation to provide a quality assessment of the state of the art in their area of expertise as of 1989 and 1991.
Author: Peter P. Wegener
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 280
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Author: J.-S. Wu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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