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Example: Turbulent flow around a cylinder

Example: Turbulent flow around a cylinder. Flow around a cylinder. Turbulent flow around a cylinder. Wall functions. U in , k and  specified. Free flow around a cylinder. Inlet velocity, Uin = 1.5 m/s. Cylinder diameter, d = 0.2 m. Air at ambient temperature, =1.5·10 -5 m 2 /s.

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Example: Turbulent flow around a cylinder

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  1. Example:Turbulent flow around a cylinder

  2. Flow around a cylinder Turbulent flow around a cylinder Wall functions Uin, k and  specified • Free flow around a cylinder. • Inlet velocity, Uin = 1.5 m/s. • Cylinder diameter, d = 0.2 m. • Air at ambient temperature, =1.5·10-5 m2/s. • Reynolds number, • Turbulence intensity at the inlet of 2%.

  3. Numerical considerations Turbulent flow around a cylinder • 900 nodes (1672 elements). • Iterative solution process requires approx. 60 MB memory. • Stabilization techniques: • Second order artificial diffusion and first order streamline diffusion for the k and  equations. • First order streamline diffusion for the momentum equations.

  4. Results Turbulent flow around a cylinder - Results • Point of seperation shows qualitative good agreement with literature. (120° from the impingement point). • Values of Cp seem to correlate well with experimental data. • The results are easily visualised with the postprocessing functionality built into COMSOL Multiphysics.

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