# Boundary condition for forced convection inside rotating cylinder

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 February 20, 2020, 03:49 Boundary condition for forced convection inside rotating cylinder #1 New Member   saka Join Date: Feb 2020 Posts: 1 Rep Power: 0 Hi. I am trying to simulate forced convection inside a rotating cylinder using pimpleFoam solver. Which boundary condition should I use for the 'U' file? is 'rotatingWallVelocity' type is the correct one? For example:- FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { bottom { type rotatingWallVelocity; origin (0 0 0); axis (0 0 1); omega 60; } top { type slip; } sides { type rotatingWallVelocity; origin (0 0 0); axis (0 0 1); omega 60; } } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // The 'bottom', 'top', and 'sides' are the three sides of the cylinder. Though it seems to simulate rotational flow inside, the solver is taking too much time to get the solution than for other cases with b.c. other than 'rotatingWallVelocity'. Is this the correct way to simulate flow inside a rotating cylinder? Suggestions are welcome.

July 5, 2020, 17:05
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Quote:
 Originally Posted by saka123 Hi. I am trying to simulate forced convection inside a rotating cylinder using pimpleFoam solver. Which boundary condition should I use for the 'U' file? is 'rotatingWallVelocity' type is the correct one? For example:- FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { bottom { type rotatingWallVelocity; origin (0 0 0); axis (0 0 1); omega 60; } top { type slip; } sides { type rotatingWallVelocity; origin (0 0 0); axis (0 0 1); omega 60; } } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // The 'bottom', 'top', and 'sides' are the three sides of the cylinder. Though it seems to simulate rotational flow inside, the solver is taking too much time to get the solution than for other cases with b.c. other than 'rotatingWallVelocity'. Is this the correct way to simulate flow inside a rotating cylinder? Suggestions are welcome.
Have you solve this issue? Got the desired results?

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