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how to calculate the Mass-averaged total pressure loss coefficient

sriluta

Hey,

iam using Omnis/turbotemplate and investigating a stator. For my mesh independence study I would like to calculate the total pressure loss coefficient ( w= 1 - Pt/Pt_inlet) upstream and downstream of the stator.  Do I have to select in results analysis  for the integration type: absolute weighted mass averaged and in w : absolute total pressure ? 

thx Hussein 

Parents
  • domen
    +1

    Hi,

    The absolute weighted mass average is going to take the absolute value of the mass flow rate for the integral. If you have reversed flow, both directions are taken into account with the same sign.

    If you use non-absolute weighted mass average, the integral keeps the signs as they are for the direction of velocity (the product of v and A) 

    The w is indeed the absolute total pressure.

Reply
  • domen
    +1

    Hi,

    The absolute weighted mass average is going to take the absolute value of the mass flow rate for the integral. If you have reversed flow, both directions are taken into account with the same sign.

    If you use non-absolute weighted mass average, the integral keeps the signs as they are for the direction of velocity (the product of v and A) 

    The w is indeed the absolute total pressure.

Children
  • sriluta
    0 in reply to domen

    ah Thx, so I did a color contour plot plot with the absolut total pressure in the 3d view. Then created  cutting planes normal to the flow direction, on the position I want to, and on the planes I calculated the absolute weighted mass average total pressure

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