# Solve parabolic coupled PDE's using MATLAB's pdepe solver?

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Jacob 2014 年 6 月 5 日
コメント済み: asim asrar 2018 年 7 月 9 日
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I know that this question may seem simple to some of you, but I'm wondering if MATLAB's pdepe tool can solve a coupled system of parabolic pde's? The general form is:
d(u1)/dt = d2(u1)/x2 - d2(u2)/x2 d(u2)/dt = d2(u2)/x2 - d2(u1)/x2
More specifically, how does the DuDx command work in the pdepe tool? Can I enter an array for the coefficients of the b function and will it know that the second column coefficient corresponds to u2?

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### 採用された回答

Bill Greene 2014 年 6 月 5 日
Yes, pdepe can definitely solve systems of pde. In general, the u argument to the functions you define has as many rows as there are pde in the system.
I'm not sure what you mean by the "b function." Do you mean the bcfun (4th argument to pdepe)? If so, the two arguments, ul and ur have as many rows as there are pde.
Example 2 on the pdepe documentation page here:
shows a two-equation system.
Bill
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Jacob 2014 年 6 月 5 日
Bill, Thanks for the response! I've reviewed the example 2, but still have a question. I know this may be basic for you and I really appreciate your help!
In example 2,
f = [0.024; 0.17] .* DuDx
If I'm understanding correctly, DuDx refers to Du1dx for the first row, and Du2dx for the second row. But in my example, I have pde's include both Du1Dx and Du2Dx in each equation.
Do you know how to incorporate both into the pdepd function? Again, I'm sure this question is basic for you and I greatly appreciate your help ! Thanks

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### その他の回答 (2 件)

Jacob 2014 年 6 月 5 日
Bill, Thanks for the response! I've reviewed the example 2, but still have a question. I know this may be basic for you and I really appreciate your help!
In example 2,
f = [0.024; 0.17] .* DuDx
If I'm understanding correctly, DuDx refers to Du1dx for the first row, and Du2dx for the second row. But in my example, I have pde's include both Du1Dx and Du2Dx in each equation.
Do you know how to incorporate both into the pdepd function? Again, I'm sure this question is basic for you and I greatly appreciate your help ! Thanks
##### 6 件のコメント表示非表示 5 件の古いコメント
Ravi Kumar 2017 年 6 月 14 日
In general, PDE Toolbox supports solution of coupled nonlinear parabolic equations. It is difficult to comment if your specific PDEs can be be solved, without seeing the equations.

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asim asrar 2018 年 7 月 9 日
i have a system of coupled wave equations given in attachment , which are varying in time and space simultaneously , can the equations be solved using pdepe command ( equations are given in attachment)
##### 4 件のコメント表示非表示 3 件の古いコメント
asim asrar 2018 年 7 月 9 日
can u share some similar examples with two variables varying simultaneously using method of lines or method of characteristics.

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