怎么定义这个方程：Uxx-a^2Ut+A＊exp(-a*x)＝0
先在CFD on line上发的帖，直接粘过来了：hello every one, i need your help now.
i'm tring to solve this PDE:Uxx-a^2Ut+A＊exp(-a*x)＝0 with openFoam,
after copying the solver "laplacianFoam"to my own directory and changing it to myLaplacianFoam, i add two lines in the "main" function in the myLaplacianFoam.c like this:
volVectorField centers = T.mesh().C();
volScalarField x = (centers&vector(1,0,0));
then define the equation :
-fvm::ddt(sqr(a),T) - fvm::laplacian(T) == -A*exp(-a*x);
the parameters A and aare defined in creatFiled.H and in transportProperties dictionary file within the case directory.
when i try to use this solver, the error echoed :
Argument of trancendental function not dimensionless
how could i deal with thisproblem?
shoul i make the argument in the exp() function dimensioniess or define the A＊exp(-a*x) as a volScalarField "f" in createFiled.H,and give "f" the original and boundary value in the case directory when i need to run the solver?
by the way ,if i want to utilize openFoam to solve some typical PDEs，where can i find the reference source?
thanks for your attention. 不能沉阿。。。。
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