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Analysis of Energy Errors of CFD/CSD Coupled Algorithms in Time Domain
DOU Yi-Bin;XU Min
2011, 31 (6):
62-68.
DOI: 10.3969/j.issn.1006-1355-2011.06.014
Two kinds of computational methods, serial partitioned algorithm and parallel partitioned algorithm, coupled by computational fluid dynamics and computational structure dynamics (CFD/CSD) algorithms in time domain, are studied. Based on the energy conservation law in the coupled interface, the effects of these coupled algorithms on energy conservation error are analyzed. The non-collocated parallel partitioned algorithm is proposed based on the parallel partitioned algorithm and non-collocated algorithm. The two-dimensional aeroelasticity test case, Isogai Wing, is analyzed numerically with different coupled algorithms. The results show that reducing the energy conservation error at the coupled interface can effectively raise computation accuracy, and the non-collocated parallel partitioned algorithm is more efficient than the strongly-coupled algorithm. The non-collocated partitioned algorithm has less energy conservation error than that of collocated partitioned algorithm, and it can make the control equation to satisfy the continuous condition in the coupled interface. Non-collocated parallel partitioned algorithm has all the merits that non-collocated partitioned algorithm and parallel partitioned algorithm have. The flutter boundary is calculated using non-collocated parallel partitioned algorithm and the results agree with those provided in some references.
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