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  2. Boundary conditions in fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Boundary_conditions_in...

    Showing wall boundary condition. The most common boundary that comes upon in confined fluid flow problems is the wall of the conduit. The appropriate requirement is called the no-slip boundary condition, wherein the normal component of velocity is fixed at zero, and the tangential component is set equal to the velocity of the wall. [1]

  3. No-slip condition - Wikipedia

    en.wikipedia.org/wiki/No-slip_condition

    The form of this boundary condition is an example of a Dirichlet boundary condition. In the majority of fluid flows relevant to fluids engineering, the no-slip condition is generally utilised at solid boundaries. [2] This condition often fails for systems which exhibit non-Newtonian behaviour. Fluids which this condition fails includes common ...

  4. Boundary conditions in computational fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Boundary_conditions_in...

    These conditions are used when we don’t know the exact details of flow distribution but boundary values of pressure are known For example: external flows around objects, internal flows with multiple outlets, buoyancy-driven flows, free surface flows, etc. The pressure corrections are taken zero at the nodes.

  5. Plug flow - Wikipedia

    en.wikipedia.org/wiki/Plug_flow

    In plug flow, the velocity of the fluid is assumed to be constant across any cross-section of the pipe perpendicular to the axis of the pipe. The plug flow model assumes there is no boundary layer adjacent to the inner wall of the pipe. The plug flow model has many practical applications. One example is in the design of chemical reactors ...

  6. Stokes problem - Wikipedia

    en.wikipedia.org/wiki/Stokes_problem

    The pressure gradient does not enter into the problem. The initial, no-slip condition on the wall is (,) = ⁡, (,) =, and the second boundary condition is due to the fact that the motion at = is not felt at infinity. The flow is only due to the motion of the plate, there is no imposed pressure gradient.

  7. Talk:No-slip condition - Wikipedia

    en.wikipedia.org/wiki/Talk:No-slip_condition

    So the shear stress at the wall from the fluid flow is only a minor perturbation on the fluid-wall interaction potential or the thermal energy of the fluid molecules. A number of research groups have been able to mimic a slip boundary condition, by placing a gas gap at the solid liquid interface or by inducing shear thinning (reduced viscosity ...

  8. Falkner–Skan boundary layer - Wikipedia

    en.wikipedia.org/wiki/Falkner–Skan_boundary_layer

    The basis of the Falkner-Skan approach are the Prandtl boundary layer equations. Ludwig Prandtl [2] simplified the equations for fluid flowing along a wall (wedge) by dividing the flow into two areas: one close to the wall dominated by viscosity, and one outside this near-wall boundary layer region where viscosity can be neglected without significant effects on the solution.

  9. Spalart–Allmaras turbulence model - Wikipedia

    en.wikipedia.org/wiki/Spalart–Allmaras...

    In physics, the Spalart–Allmaras model is a one-equation model that solves a modelled transport equation for the kinematic eddy turbulent viscosity.The Spalart–Allmaras model was designed specifically for aerospace applications involving wall-bounded flows and has been shown to give good results for boundary layers subjected to adverse pressure gradients.