/[escript]/trunk/modellib/py_src/flow.py
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revision 2549 by jfenwick, Mon Jul 20 06:43:47 2009 UTC revision 2625 by jfenwick, Fri Aug 21 06:30:25 2009 UTC
# Line 26  from esys.escript.linearPDEs import Lame Line 26  from esys.escript.linearPDEs import Lame
26  class SteadyIncompressibleFlow(Model):  class SteadyIncompressibleFlow(Model):
27         """         """
28    
29         M{-\left(\eta\left(v_{i,j}+v_{j,i}\right)\right)_{,j}+p_{,i}=F_i}         *-\left(\eta\left(v_{i,j}+v_{j,i}\right)\right)_{,j}+p_{,i}=F_i*
30                
31         M{\sigma_{ij}=2\eta D_{ij}-p\,\delta_{ij}}         *\sigma_{ij}=2\eta D_{ij}-p\,\delta_{ij}*
32    
33         M{D_{ij}=\frac{1}{2}\left( v_{j,i} + v_{i,j }\right)}         *D_{ij}=\frac{1}{2}\left( v_{j,i} + v_{i,j }\right)*
34                
35         M{v_{k,k} = 0}         *v_{k,k} = 0*
36    
37         """         """
38    

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