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A Data Parallel Multizone Navier-Stokes CodeWe have developed a data parallel multizone compressible Navier-Stokes code on the Connection Machine CM-5. The code is set up for implicit time-stepping on single or multiple structured grids. For multiple grids and geometrically complex problems, we follow the "chimera" approach, where flow data on one zone is interpolated onto another in the region of overlap. We will describe our design philosophy and give some timing results for the current code. The design choices can be summarized as: 1. finite differences on structured grids; 2. implicit time-stepping with either distributed solves or data motion and local solves; 3. sequential stepping through multiple zones with interzone data transfer via a distributed data structure. We have implemented these ideas on the CM-5 using CMF (Connection Machine Fortran), a data parallel language which combines elements of Fortran 90 and certain extensions, and which bears a strong similarity to High Performance Fortran (HPF). One interesting feature is the issue of turbulence modeling, where the architecture of a parallel machine makes the use of an algebraic turbulence model awkward, whereas models based on transport equations are more natural. We will present some performance figures for the code on the CM-5, and consider the issues involved in transitioning the code to HPF for portability to other parallel platforms.
Document ID
20020014365
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Jespersen, Dennis C.
(NASA Ames Research Center Moffett Field, CA United States)
Levit, Creon
(NASA Ames Research Center Moffett Field, CA United States)
Kwak, Dochan
Date Acquired
August 20, 2013
Publication Date
January 1, 1995
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: Computational Aerosciences Conference
Location: Moffett Field, CA
Country: United States
Start Date: March 7, 1995
End Date: March 9, 1995
Sponsors: NASA Ames Research Center
Funding Number(s)
PROJECT: RTOP 509-10-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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