A Numerical Manifold Method for Solving 2D Transient Nonlinear Heat Conduction Problems
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摘要: 数值流形法(numerical manifold method,NMM)通过引入两套覆盖系统:数学覆盖用于构造单位分解函数;物理覆盖用于构造局部逼近函数,有效实现了连续与不连续问题的统一处理. 该文深入研究了NMM在二维瞬态非线性热传导问题的应用. 首先,根据瞬态非线性热传导的控制方程、初始条件以及边界条件,建立了初边值问题的弱形式. 随后,提出了温度场的NMM近似表达式,采用Galerkin法推导出全局离散格式. 在时间离散方面,采用Euler向后差分法,并结合Newton-Raphson迭代法求解了最终的代数方程组. 通过对具有不规则边界和含孔洞的不连续板等典型算例进行模拟,结果表明NMM不仅计算精度高(最大的误差不超过0.6%)、鲁棒性好,更能有效处理复杂几何形状和不连续性板,为该领域的数值计算提供了一种高效的新方法.
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关键词:
- 非线性热传导 /
- 数值流形法 /
- Galerkin法 /
- Newton-Raphson法 /
- 温度场
Abstract: The numerical manifold method (NMM) effectively realizes the unified treatment of continuous and discontinuous problems through introduction of 2 cover systems: the mathematical cover for constructing the partition of unity functions and the physical cover for constructing the local approximation function. The application of the NMM to 2D transient nonlinear heat conduction problems was investigated. Firstly, based on the governing equations for the transient nonlinear heat conduction, along with the initial and boundary conditions, the weak form of the initial-boundary value problem was established. Subsequently, an NMM approximate expression for the temperature field was presented and the global discretization form was derived with the Galerkin method. For the time discretization, the backward Euler difference method was used and combined with the Newton-Raphson iterative method to solve the algebraic equations. From simulation of typical discontinuous plates with irregular boundaries and holes, the results show that, the NMM not only has high computational accuracy (the maximum error is not more than 0.6%) and good robustness, but also can handle complex geometries and discontinuous plates more effectively, which provides an innovative and efficient new method for numerical computation in this field.-
Key words:
- nonlinear heat conduction /
- numerical manifold method /
- Galerkin method /
- Newton-Raphson method /
- temperature field
edited-byedited-by1) (我刊编委郑宏来稿) -
表 1 NMM和FEM计算不同时刻的A1和A2两点的温度值
Table 1. The temperatures of point A1 and A2 at different moments calculated by NMM and FEM
t/s point A1 point A2 NMM FEM error/% NMM FEM error/% 1 100.02 100.01 0.002 3 100.73 100.56 0.168 4 2 100.73 100.62 0.110 3 108.86 108.80 0.056 6 3 103.99 103.74 0.242 1 120.51 120.88 0.308 3 4 109.46 109.27 0.173 7 130.27 130.92 0.493 6 5 115.55 115.45 0.084 3 137.75 138.50 0.539 5 6 121.22 121.29 0.056 1 143.49 144.23 0.509 8 7 126.09 126.33 0.189 2 147.97 148.64 0.451 0 8 130.09 130.46 0.281 0 151.49 152.08 0.386 4 9 133.30 133.80 0.370 1 154.28 154.87 0.384 0 10 135.85 136.42 0.421 5 156.47 157.08 0.387 0 表 2 B1和B2两点不同时刻的温度值
Table 2. The temperatures of point B1 and B2 at different moments
t/s point B1 point B2 NMM FEM error/% NMM FEM error/% 2 799.26 800.21 0.118 7 794.04 795.49 0.182 3 4 793.90 794.93 0.129 6 780.81 781.37 0.071 7 6 784.12 784.9 0.099 4 766.16 766.53 0.048 3 8 772.01 772.68 0.086 7 752.38 752.54 0.021 3 10 759.33 759.66 0.043 4 739.99 739.83 0.022 0 表 3 B3, B4, B5和B6四个点不同时刻的温度值
Table 3. The temperatures of point B3, B4, B5 and B6 at different moments
point FEM PEDM error/% EDM error/% NMM error/% B3 734.307 728.484 0.793 733.681 0.085 735.244 0.128 B4 774.639 770.477 0.537 773.307 0.172 771.633 0.388 B5 775.070 770.261 0.620 773.389 0.217 771.74 0.429 B6 735.843 732.233 0.490 733.897 0.264 735.179 0.090 表 4 C1和C2两点不同时刻的温度值
Table 4. The temperatures of point C1 and C2 at different moments
t/s point C1 point C2 NMM FEM error/% NMM FEM error/% 1 499.41 499.46 0.009 4 498.04 498.07 0.006 9 2 498.51 498.50 0.001 6 495.95 496.01 0.012 6 3 497.53 497.50 0.006 6 494.1 494.15 0.010 2 4 496.57 496.54 0.006 6 492.45 492.49 0.007 1 5 495.65 495.62 0.005 5 490.95 490.98 0.006 0 6 494.76 494.73 0.006 0 489.57 489.60 0.006 4 7 493.90 493.86 0.008 5 488.27 488.33 0.011 5 8 493.07 493.03 0.007 6 487.06 487.13 0.015 3 9 492.25 492.21 0.008 3 485.93 486.01 0.017 1 10 491.45 491.40 0.009 6 484.85 484.95 0.020 5 -
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