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negative volume fraction after solving in coefficient form of pde comsol
Posted 29 mai 2016, 10:10 UTC−4 0 Replies
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i am trying to solve a pde
c_t + 11*z*c_x = -(1.1*10^(-9))( c_xx + c_yy -1.5* c_zz )
where c_t is first partial derivative of c wrt to t
c_x is the first partial derivative of c wrt to x and so on.
you can view the pde here also :
drive.google.com/open?id=0B2b26R9E378-MXpqWWxkbkdwblU
I am solving it in a cubic domain with side length of 1mm.
the is a no flux boundary condition at x and y faces and periodic boundary condition in z.
The initial values of c is random with a mean of 0.1.
I have made a comsol file but I am getting the value of volume fraction as negative as well as well beyond +1 . I want to limit is in between 0 and 1.
Please help me in this regard.
I am unable to upload my file here so you can download my file from here: drive.google.com/open?id=0B2b26R9E378-MXpqWWxkbkdwblU
Hello Ramanish Singh
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