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Automated Euler and Navier-Stokes Database Generation for a Glide-Back BoosterThe past two decades have seen a sustained increase in the use of high fidelity Computational Fluid Dynamics (CFD) in basic research, aircraft design, and the analysis of post-design issues. As the fidelity of a CFD method increases, the number of cases that can be readily and affordably computed greatly diminishes. However, computer speeds now exceed 2 GHz, hundreds of processors are currently available and more affordable, and advances in parallel CFD algorithms scale more readily with large numbers of processors. All of these factors make it feasible to compute thousands of high fidelity cases. However, there still remains the overwhelming task of monitoring the solution process. This paper presents an approach to automate the CFD solution process. A new software tool, AeroDB, is used to compute thousands of Euler and Navier-Stokes solutions for a 2nd generation glide-back booster in one week. The solution process exploits a common job-submission grid environment, the NASA Information Power Grid (IPG), using 13 computers located at 4 different geographical sites. Process automation and web-based access to a MySql database greatly reduces the user workload, removing much of the tedium and tendency for user input errors. The AeroDB framework is shown. The user submits/deletes jobs, monitors AeroDB's progress, and retrieves data and plots via a web portal. Once a job is in the database, a job launcher uses an IPG resource broker to decide which computers are best suited to run the job. Job/code requirements, the number of CPUs free on a remote system, and queue lengths are some of the parameters the broker takes into account. The Globus software provides secure services for user authentication, remote shell execution, and secure file transfers over an open network. AeroDB automatically decides when a job is completed. Currently, the Cart3D unstructured flow solver is used for the Euler equations, and the Overflow structured overset flow solver is used for the Navier-Stokes equations. Other codes can be readily included into the AeroDB framework.
Document ID
20040042408
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Chaderjian, Neal M.
(NASA Ames Research Center Moffett Field, CA, United States)
Rogers, Stuart E.
(NASA Ames Research Center Moffett Field, CA, United States)
Aftosmis, Mike J.
(NASA Ames Research Center Moffett Field, CA, United States)
Pandya, Shishir A.
(NASA Ames Research Center Moffett Field, CA, United States)
Ahmad, Jasim U.
(Eloret Corp. Moffett Field, CA, United States)
Tejnil, Edward
(Eloret Corp. Moffett Field, CA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Computer Programming And Software
Meeting Information
Meeting: Third International Conference on Computational Fluid Dynamics
Location: Toronto
Country: Canada
Start Date: July 12, 2004
End Date: July 16, 2004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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