瞬態(tài)熱傳導問題的精細積分-雙重互易邊界元法
[Abstract]:The dual reciprocal boundary element method and the precise integration method are used to solve the transient heat conduction problem of two dimensional heat source. For the domain integral caused by the heat source term and the time derivative term of temperature in the boundary integral equation, the domain integral is transformed into the boundary integral by using the double reciprocal method. After the boundary integral equation is discretized by the boundary element method, the system of differential equations about time is obtained, and the exponential matrix is treated by the precise integration method. The inhomogeneous terms caused by boundary conditions and heat source terms in differential equations are calculated by analytical method. In order to compare the computational effect of the precise integral-double reciprocal boundary element method, the derivative term of temperature to time is calculated by using the finite difference method. The effectiveness and accuracy of the proposed method are verified by numerical examples. The results show that the time step size has little effect on the results of the precise integral-dual reciprocal boundary element method, while the finite difference method is more sensitive to the time step size and is effective only when the time step size is small. When a large time step is selected, the precision integral-dual reciprocal boundary element method still has a good calculation accuracy.
【作者單位】: 合肥工業(yè)大學土木與水利工程學院;
【基金】:國家自然科學基金(11672098;11502063) 安徽省自然科學基金(1608085QA07)
【分類號】:O241.8
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