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Fast Hex Meshing Compared with Tetrahedral Meshing

	Posted Sun February 12, 2006 @06:33PM
	The purpose of a recent study performed by DaimlerChrysler was to compare the performance of Harpoon-based CFD against previous solutions of internal flow through an automotive water pump using tetrahedral meshes. The effect of mesh skew on accuracy and convergence was observed. Fourteen operating speeds were simulated from 1000-7500rpm at 500rpm increments.

	Inlet velocities were derived based on the test mass flow measurements. Pressure rise & flow split between volutes were solved. Excellent agreement was obtained using a Harpoon mesh containing approximately 3M cells at a fraction of the simulation effort required for a full tet mesh. The following was concluded: The hexa-dominant mesh improves the convergence quality & rate of the model, even with reduced mesh resolution Mass conservation residuals dropped by up 90% Kinetic Energy residuals dropped by up to 20% Convergence time was reduced by more than 30% for the initial condition case, up to 80% for the consecutive cases

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