Error invalid Ranks in the product, When I run the tutorial in Fenics Navier Stokes
3 months ago by
I am New in Fenics, and I am trying to run the turorial of Navier Stokes Equation, when I writte the weak formulation of the equation I get an error " Invalid ranks 1 and 2 in product.", but I dont know whats is the problem.
The code of variational formulation is given as:
F1 = rho*dot((u-u_n)/ k, v)*dx + rho*dot(dot(u_n, nabla_grad(u_n)),v)*dx + inner (sigma(U, p_n), epsilon(v))*dx
+ dot(p_n*n,v)*ds - dot(mu*nabla_grad(U)*n,v)*ds - dot(f, v)*dx
a1 = lhs(F1)
L1 = rhs(F1)
I appreciate that someone can help me with this ¡¡¡¡
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