Implementation of a Hypersonic Rarefied Flow Particle Simulation on the Connection Machine PDF Download
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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: 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: Research Institute for Advanced Computer Science (U.S.)
Publisher:
ISBN:
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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Book Description
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: Donald Baganoff
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 84
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 988
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 936
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
The combined Direct Simulation Monte Carlo (DSMC) and Monotonic Lagrangian Grid (MLG) methodologies are used on the massively parallel Connection Machines CM-5 to solve for the properties of a low density hypersonic flow through a channel containing a wedge. Numerical issues related to grid generation around the obstacle, the effects of resolution in terms of the simulated to actual particle ratio, and the use of time-averaging to obtain a statistically converged solution are discussed. A method is presented for quantifying the effects of the grid on the solution. The flow field shows many important aerodynamic features, such as shock waves, boundary layers, expansion fan, and their interactions. Since the flow is so rarefied, these structures are diffuse compared to what is expected in a continuum flow. For example, the reattachment shock behind the trailing edge of the wedge degenerates into a diffuse viscous layer. Other low density effects include the velocity slip, which peaks near the leading edges where the density is low, and temperature jump of the gas adjacent to the solid surfaces, which is highest at the entrance of the channel and decreases further downstream. The calculated skin friction and heat transfer agree well with the Reynolds analogy for boundary layer flow. The computed pressure distributions along the wall are consistent with hypersonic viscous theory and other DSMC calculations.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1208
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
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Author: Jeffrey Douglas McDonald
Publisher: Ann Arbor, Mich. : University Microfilms International
ISBN:
Category :
Languages : en
Pages : 164
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