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- - **how to define this PDE:Uxx-a^2Ut+A＊exp(-a*x)＝0**
(*http://www.cfd-online.com/Forums/openfoam-solving/94425-how-define-pde-uxx-2ut-exp-x-0-a.html*)

how to define this PDE:Uxx-a^2Ut+A＊exp(-a*x)＝0hello 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 a are 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 this problem? 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. |

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