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Parametric study of a new HOS-CFD coupling method
Journal of Hydrodynamics ( IF 2.5 ) Pub Date : 2021-03-05 , DOI: 10.1007/s42241-021-0012-1
Yuan Zhuang , De-cheng Wan

This paper presents a developed new coupled method which combined our in-house CFD solver naoe-FOAM-SJTU and naoe-FOAM-os with a potential theory High Order Spectral method (HOS). A parametric study of nonlinear wave propagation in computational fluid dynamics (CFD) zone is considered. Mesh convergence, time step convergence, time discretization scheme and length of relaxation zone are all carried out. Those parametric studies verify the steady of this new combined method and give better choice for wave propagation. The dissipation in propagation of nonlinear regular wave can be lower than 3% in static mesh, and less than 2% in overset grid mesh. Meanwhile, a LNG FPSO is put into the viscous wave tank to study the suitable size of CFD zone. To achieve a better solution with least calculating resources and best numerical results, the length of CFD zone is discussed. These parametric studies can give reference upon employment of the potential-viscous coupled method and validation of the coupled method.



中文翻译:

新的HOS-CFD耦合方法的参数研究

本文提出了一种开发的新的耦合方法,该方法将我们的内部CFD求解器naoe-FOAM-SJTU和naoe-FOAM-os与势能理论高阶谱方法(HOS)相结合。考虑了在计算流体力学(CFD)区域中非线性波传播的参数研究。进行了网格收敛,时间步收敛,时间离散方案和松弛区域的长度。这些参数研究证明了这种新组合方法的稳定性,并为波传播提供了更好的选择。在静态网格物体中,非线性规则波传播的耗散可低于3%,而在偏心网格物体中,其耗散可低于2%。同时,将LNG FPSO放入粘性波箱中以研究CFD区域的合适尺寸。为了以最少的计算资源和最佳的数值结果来获得更好的解决方案,讨论了CFD区域的长度。这些参数研究可以为潜在的粘性耦合方法的应用和耦合方法的验证提供参考。

更新日期:2021-03-08
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