一种新的界面处理方法在气固耦合传热中的应用

对于高超声速流场和固体结构温度场的耦合传热问题,推导出了一种新的界面耦合处理方法,通过在流固交界面上求解由狄里科利和牛顿边界条件得出的偏微分方程,把对流体和固体两个区域的影响显式地体现在交界面方程中,并对该方法进行了稳定性分析.分析表明:该方法相比于传统的耦合迭代方法有更好的稳定性.将这套算法成功应用于绕无限长圆柱的气动加热计算中,对圆柱在气动加热过程中的温度变化做了比较详细的分析.

New interface boundary condition method for coupled thermal simulations

A new interface boundary condition method was advanced for coupling between hypersonic flow field and structural heat transfer. The new coupling scheme consisted of solving an additional partial differential equation on the interface, which was derived from the Dirichlet and Neumann conditions at the interface. The interface solution was explicitly influenced by the two subdomains. The Godunov-Ryabenkii method was used to analyze the stability properties of the method. The analysis indicats that the method is not only more stable but also more accurate than the conventional method. The method proposed is applied for aerodynamically infinite column. The transformation of column-s temperature is detailedly analyzed during pneumatic heat.