SC13 Home > SC13 Schedule > SC13 Presentation - Petascale Direct Numerical Simulation of Turbulent Channel Flow on up to 786K Cores

SCHEDULE: NOV 16-22, 2013

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Petascale Direct Numerical Simulation of Turbulent Channel Flow on up to 786K Cores

SESSION: Extreme-Scale Applications

EVENT TYPE: Papers, Awards, Best Student Paper Finalists

TIME: 1:30PM - 2:00PM

SESSION CHAIR: Michael A. Heroux

AUTHOR(S):Myoungkyu Lee, Nicholas Malaya, Robert D. Moser


We present results of performance optimization for direct numerical simulation (DNS) of wall bounded turbulent flow (channel flow). DNS is a technique in which the fluid flow equations are solved without subgrid modeling. Of particular interest are high Reynolds number(Re) turbulent flows over walls, because of their importance in technological applications. Simulating high Re turbulence is a challenging computational problem, due to the high spatial and temporal resolution requirements. An optimized code was developed using spectral methods, the method of choice for turbulent flows. Optimization was performed to address three major issues: efficiency of banded matrix linear algebra, cache reuse and memory access, and communication for the global data transposes. Results show that performance is highly dependent on characteristics of the communication network, rather than single-core performance. In our tests, it exhibits approximately 80% strong scaling parallel efficiency at 786K cores relative to performance on 65K cores.

Chair/Author Details:

Michael A. Heroux (Chair) - Sandia National Laboratories

Myoungkyu Lee - University of Texas at Austin

Nicholas Malaya - University of Texas at Austin

Robert D. Moser - University of Texas at Austin

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The full paper can be found in the ACM Digital Library