一种局部动态数据交换方法在流固耦合分析中的应用

 准确有效的数据交换方法是流固耦合(FSI)计算的关键,为此,提出了一种局部动态的耦合界面数据交换方法,一方面避免了曲面拟合方法由于病态矩阵引起的数值不稳定性和整体插值计算量大的问题,另一方面克服了表面跟踪方法引起的表面不光顺、出现锯齿状的问题。为了验证该方法,对三维柱面和某临近空间螺旋桨及某高空气球进行了分析,并与常体积四面体(CVT)方法做了比较。结果表明该方法在数值稳定性和表面光顺性方面有很大优势,是一种适合流固耦合分析的界面数据交换方法。

Local Dynamic Data Exchange in Fluid Structure Interaction Analysis

Accurate and effective data exchange is key to fluid structure interaction (FSI) analysis. This paper proposes a local dynamic data exchange method to perform the FSI analysis, which overcomes the difficulties of the surface fitting methods such as numerical instability due to ill-conditioned system matrix from the manifolds in curved geometries and requirement of a huge amount of CPU time in interpolating a large quantity of data. This approach also overcomes such difficulties of the surface tracking methods as numerical errors due to the roughness from ambiguity of normal directions around edges. In order to validate the method, a 3D cylinder, a near space propeller and a high altitude balloon are analyzed and the results compared with those of the constant volume tetrahedron (CVT) method, which demonstrates that the method is superior in numerical stability and surface smoothness, and is suitable for data exchange in FSI analysis.