Evaluation AC7-03: Difference between revisions
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==Influence of the Discretization Error with URANS== | ==Influence of the Discretization Error with URANS== | ||
The error intervals of total pressure heads were up to 4.8% for the finest grid. From an engineering point of view, these uncertainties are in an acceptable range for the design of a VAD. In addition, the uncertainty for the pressure head for the whole VAD (4.8%) is higher than for the rotor alone (1.7%). The reason for this could be that turbulent phenomena, e.g. detachment in the outlet guide vane, affect the pressure increase via the whole pump. Those effects may have a significant mesh sensitivity and thus affect the uncertainty of the pressure head for the entire VAD. Furthermore, the relatively small uncertainties for the pressure heads suggest that the grid resolution of UR-7 is fine enough to guarantee a grid-independent solution and no further grid refinement seems to be required for these results. | |||
==Experimental Validation of URANS and LES== | ==Experimental Validation of URANS and LES== | ||
Revision as of 13:51, 8 November 2021
Turbulent Blood Flow in a Ventricular Assist Device
Application Challenge AC7-03 © copyright ERCOFTAC 2021
Evaluation
Influence of the Discretization Error with URANS
The error intervals of total pressure heads were up to 4.8% for the finest grid. From an engineering point of view, these uncertainties are in an acceptable range for the design of a VAD. In addition, the uncertainty for the pressure head for the whole VAD (4.8%) is higher than for the rotor alone (1.7%). The reason for this could be that turbulent phenomena, e.g. detachment in the outlet guide vane, affect the pressure increase via the whole pump. Those effects may have a significant mesh sensitivity and thus affect the uncertainty of the pressure head for the entire VAD. Furthermore, the relatively small uncertainties for the pressure heads suggest that the grid resolution of UR-7 is fine enough to guarantee a grid-independent solution and no further grid refinement seems to be required for these results.
Experimental Validation of URANS and LES
Comparison of Different URANS methods
Contributed by: B. Torner — University of Rostock, Germany
© copyright ERCOFTAC 2021