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发表于 2003-6-10 11:11:49
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来自 香港
回复: 【讨论】这个偏微分方程用matlab怎么解?
跟传热那个不一样
这个是类似对流问题
看看matlab网站上这么说的:
Solution Number: 4382
Date Last Modified: 2002-02-15
Product: Partial Differential Equation 1.0 ==> Current Version
Platform: All Builds
Problem Description
Can the Partial Differential Equation (PDE) Toolbox handle convection coefficients (terms with first order space derivatives) in heat transfer problems?
Solution:
There is no way of entering convection terms in the PDE Toolbox. Convection terms are first order space derivatives (such as du/dx); these are different than first order time derivatives, which can be handled in the parabolic equation.
For static problems, it is often possible to formulate a nonlinear problem that contains the convection terms by putting the first order space derivative in the 'f' coefficient of the standard equation. The first order space derivatives are available as ux and uy in the expression.
If the problem is not too strongly hyperbolic, the nonlinear solver will probably converge. If you turn on full Jacobian, convergence is even more likely.
看来对空间变量一阶比二阶的还不好办啊 |
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