Parallel spatial direct numerical simulation of boundary-layer flow transition on IBM SP1

Conference · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:93990

Hanebutte, U R ^[1]; Joslin, R D ^[2]; Zubair, M ^[3]

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1. Argonne National Lab., IL (United States)
2. National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
3. International Business Machines Corp., Yorktown Heights, NY (United States). Thomas J. Watson Research Center

The spatially evolving disturbances that are associated with laminar-to-turbulent transition in three-dimensional boundary-layer flows are computed with the PSDNS code on an IBM SP1 parallel supercomputer. By remapping the distributed data structure during the course of the calculation, optimized serial library routines can be utilized that substantially increase the computational performance. Although the remapping incurs a high communication penalty, the parallel efficiency of the code remains above 40 percent for all performed calculations. By using appropriate compile options and optimized library routines, the serial code achieves 52-56 Mflops on a single node of the SP1 (45 percent of theoretical peak performance). The actual performance of the PSDNS code on the SP1 is evaluated with a ``real world`` simulation that consists of 1.7 million grid points. Comparisons to the Cray Y/MP and Cray C-90 are made for this large scale simulation.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 93990
• Report Number(s): ANL/RA/CP--84600; CONF-950431--4; ON: DE95013675
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS
ARRAY PROCESSORS
BOUNDARY LAYERS
COMPUTERIZED SIMULATION
DISTURBANCES
INCOMPRESSIBLE FLOW
ITERATIVE METHODS
PARALLEL PROCESSING
TURBULENT FLOW
VISCOUS FLOW