/[escript]/trunk-mpi-branch/escript/py_src/linearPDEs.py
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revision 637 by gross, Thu Mar 23 10:55:31 2006 UTC revision 657 by gross, Fri Mar 24 08:28:15 2006 UTC
# Line 1807  class LameEquation(LinearPDE): Line 1807  class LameEquation(LinearPDE):
1807     """     """
1808     Class to define a Lame equation problem:     Class to define a Lame equation problem:
1809    
1810     M{-grad(S{mu}*(grad(u[i])[j]+grad(u[j])[i]))[j] - grad(S{lambda}*grad(u[j])[i])[j] = F_i -grad(S{sigma}[i,j])[j] }     M{-grad(S{mu}*(grad(u[i])[j]+grad(u[j])[i]))[j] - grad(S{lambda}*grad(u[k])[k])[j] = F_i -grad(S{sigma}[ij])[j] }
1811    
1812     with natural boundary conditons:     with natural boundary conditons:
1813    
1814     M{n[j]*(S{mu}*(grad(u[i])[j]+grad(u[j])[i]) - S{lambda}*grad(u[j])[i]) = f_i -n[j]*S{sigma}[i,j] }     M{n[j]*(S{mu}*(grad(u[i])[j]+grad(u[j])[i]) + S{lambda}*grad(u[k])[k]) = f_i +n[j]*S{sigma}[ij] }
1815    
1816     and constraints:     and constraints:
1817    

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