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Sia Ghelichkhan committed Apr 28, 2022
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10 changes: 4 additions & 6 deletions 07-GD-2D-cylindrical.ipynb
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" + \\int_\\Omega \\left(\\nabla q\\right) \\cdot \\left(\\kappa \\nabla T\\right) \\ dx = 0 \\text{ for all } q\\in Q.$$\n",
"\n",
"\n",
"In the Cartesian examples considered below, zero-slip and free-slip boundary conditions for \\eqref{eq:weak_mom} and \\eqref{eq:weak_cont} are imposed through strong Dirichlet boundary conditions for velocity $\\vec{u}$. This is achieved by restricting the velocity function space $V$ to a subspace $V_0$\n",
"In the Cartesian examples we saw earlier are imposed through strong Dirichlet boundary conditions for velocity $\\vec{u}$. This is achieved by restricting the velocity function space $V$ to a subspace $V_0$\n",
"of vector functions for which all components (zero-slip) or only the normal\n",
"component (free-slip) are zero at the boundary. Since this restriction also\n",
"applies to the test functions $\\vec{v}$, the weak form only needs to be\n",
Expand All @@ -57,13 +57,11 @@
" -\\int_{\\partial\\Omega} \\vec{v}\\cdot \\left(\\mu \\left[\\nabla\\vec{u}\n",
" + \\left(\\nabla\\vec{u}\\right)^T\\right]\\right)\\cdot \\vec{n} ds\n",
"\\end{equation}\n",
"that was required to obtain the integrated by parts viscosity term in Equation\n",
"\\eqref{eq:weak_mom}, automatically vanishes for zero-slip boundary conditions as\n",
"that was required to obtain the integrated by parts viscosity term, automatically vanishes for zero-slip boundary conditions as\n",
"$\\bf v =0$ at the domain boundary, $\\partial\\Omega$. In the case of a free-slip\n",
"boundary condition for which the tangential components of $\\vec{v}$ are\n",
"non-zero, the boundary term does not vanish, but by omitting that term in\n",
"\\eqref{eq:weak_mom} we weakly impose a zero shear stress condition. The boundary\n",
"term obtained by integrating the pressure gradient term in \\eqref{eq:cmass} by parts,\n",
"non-zero, the boundary term does not vanish, but by omitting that term, we weakly impose a zero shear stress condition. The boundary\n",
"term obtained by integrating the pressure gradient term by parts,\n",
"\\begin{equation}\n",
" \\int_{\\partial\\Omega} \\vec{v}\\cdot\\vec{n} p ds ,\n",
"\\end{equation}\n",
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