![]() There are two related measures of fluid viscosityĪbsolute viscosity - coefficient of absolute viscosity - is a measure of internal resistance. viscosity is the measure of a fluid's resistance to flow.The shear resistance in a fluid is caused by inter-molecular friction exerted when layers of fluid attempt to slide by one another. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. Results: in the left window is the solution obtained with direct numerical simulation (aka Dokken’s wonderful tutorial) and in the right one is the output of my slow ass simulation.Viscosity is an important fluid property when analyzing liquid behavior and fluid motion near solid boundaries.Progress = tqdm.tqdm(desc="Solving PDE", total=num_steps)ī1.ghostUpdate(addv=_VALUES, mode=)ī2.ghostUpdate(addv=_VALUES, mode=)ī3.ghostUpdate(addv=_VALUES, mode=) Vtx_p = VTXWriter(m, "./outputs/p-lens.bp", ) ![]() Vtx_u = VTXWriter(m, "./outputs/u-les.bp", ) # PASO 3: INCOMPRESIBILIDAD DE LA VELOCIDAD # dt * inner(Sij(u_tent), Sij(u_tent)) * inner(grad(u_tent), grad(v)) # PASO 1: VELOCIDAD APROXIMADA (NO INCOMPRESIBLE)ĭt * inner(dot(u_n, nabla_grad(u_n)), v) * dx + \ĭt * (nu + nu_T(u_n)) * inner(grad(u_tent), grad(v)) * dx #+ \ P_ = Function(Q) # p disponible como función U_n = Function(V) # Función para almacenar el timestep anterior U_ = Function(V) # u_tent disponible como función # Condiciones de contorno de la presiónīcp_outlet = dirichletbc(PETSc.ScalarType(0.0), locate_dofs_topological(Q, fdim, ft.find(outlet_marker)), Q) U_nonslip = np.array((0,) *, dtype=PETSc.ScalarType)īcu_walls = dirichletbc(u_nonslip, locate_dofs_topological(V, fdim, ft.find(wall_marker)), V)īcu_obstacle = dirichletbc(u_nonslip, locate_dofs_topological(V, fdim, ft.find(obstacle_marker)), V)īcu = # Condiciones de contorno de la velocidadīcu_inflow = dirichletbc(u_inlet, locate_dofs_topological(V, fdim, ft.find(inlet_marker))) Values = np.zeros((gdim, x.shape),dtype=PETSc.ScalarType) Scalar_element = FiniteElement("CG", mesh.ufl_cell(), 1) Vector_element = VectorElement("CG", mesh.ufl_cell(), 2) # ESPACIOS DE FUNCIONES Y FUNCIONES: ELEMENTOS TAYLOR-HOOD ![]() Nu = Constant(mesh, PETSc.ScalarType(mu/rho)) # Viscosidad cinemáticaį = Constant(mesh, PETSc.ScalarType((0, 0))) # Body forcesĬs = PETSc.ScalarType(0.035) # Constante de Smagorinsky Rho = Constant(mesh, PETSc.ScalarType(1.0)) # Densidad (cambiar) Mu = Constant(mesh, PETSc.ScalarType(1.0e-4)) # Viscosidad dinámica (cambiar) Inlet_marker, outlet_marker, wall_marker, obstacle_marker = 2, 3, 4, 5ĭt = Constant(mesh, PETSc.ScalarType(dt)) Mesh, _, ft = gmshio.read_from_msh("cyllinder.msh", MPI.COMM_WORLD, rank=0, gdim=gdim) ![]() Sorry for the comments in Spanish, they are not too meaningfullįrom dolfinx.fem import (Constant, Function, FunctionSpace,Īssemble_scalar, dirichletbc, form, locate_dofs_topological, set_bc)įrom import (apply_lifting, assemble_matrix, assemble_vector,įrom dolfinx.io import (VTXWriter, distribute_entity_data, gmshio)įrom ufl import (FacetNormal, FiniteElement, Identity, Measure, TestFunction, TrialFunction, VectorElement,Īs_vector, div, dot, ds, dx, inner, lhs, grad, nabla_grad, rhs, sym)
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