Improvements in speed for explicit,transient compressible flow solvers |
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| Authors: | Rainald Löhner Hong Luo Joseph D Baum Darren Rice |
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| Institution: | 1. CFD Center, Department of Computational and Data Science, M.S. 6A2, College of Science, George Mason University, Fairfax, VA 22030‐4444, U.S.A.;2. Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695‐7910, U.S.A.;3. Advanced Concepts Business Unit, Science Applications International Corporation, McLean, VA, U.S.A.;4. U.S. Government, Washington, DC, U.S.A. |
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| Abstract: | Several explicit high‐resolution schemes for transient compressible flows with moving shocks are combined in such a way so as to achieve the highest possible speed without compromising accuracy. The main algorithmic changes considered comprise the following: - replacing limiting and approximate Riemann solvers by simpler schemes during the initial stages of Runge–Kutta solvers, and only using limiting and approximate Riemann solvers for the last stage;
- automatically switching to simpler schemes for smooth flow regions;
- automatic deactivation of quiescent regions; and
- unstructured grids with cartesian cores or embedded cartesian grids.
The results from several examples demonstrate that speedup factors of 1:4 are attainable without compromising the accuracy of the traditional FCT schemes. Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | compressible flow solvers explicit timestepping computational techniques TVD FCT CFD |
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