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Previous: Test case: Backward-Facing-Step Up: Test case: Backward-Facing-Step Next: Test case set-up

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Test case introduction

  • Flow in channel with sudden widening
  • Test case geometry:
openfoam tutorial backward facing step pitzDaily sketch

Figure: Backward-Facing-Step geometry

  • Physical properties:
    • Inlet velocity: U = 10 m/s
    • Inlet width: h = 2.54 cm
    • Turbulent air flow, $ \nu = 1\cdot10^{-5} \Rightarrow Re \approx 25 400 $
    • Incompressible fluid flow
    • Isothermal
    • Steady state

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Previous: Hydro Turbine Efficiency Up: Formulas for the Efficiency Next: Compressor Efficiency
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Pump Efficiency

The pump efficiency can be evaluated using following efficiency formula: img99 where $ \eta$ denotes the efficiency, $ M$ is the torque, $ \omega$ is the angular velocity, $ Q$ is the volume flow rate and $ h$ is the specific enthalpy which can be evaluated as follows: img97 1 Subscript in means averaged quantities at the inlet, whereas subscript out denotes averaged quantities at the outlet. The evaluation of pump efficiency for different patches is also possible.

OpenFOAM Training by CFD Support,   CFD SUPPORT,   info@cfdsupport.com    +420 212 243 883      © CFD support, s.r.o., Sokolovská 270/201, 190 00 Praha 9, Czech Republic