mass flow rate calculation

- March 9, 2020 at 9:30 am
  
  asishapradhan
  Subscriber
  
  I want to calculate the mass flow rate in a passage and the position of the passage is changing from time to time...how to calculate the mass flow rate at the crosssection?
  
  i have given the picture of the passage
- March 9, 2020 at 4:58 pm
  
  Steve
  Ansys Employee
  
  Hi,
  
  In CFD-Post, you can add a plane that intersects the thin gap and then use the Function Calculator to get the mass flow on the plane. There isn't a built in way to move the plane as the geometry changes, however you could do this with Power Syntax scripting. Please see the CFX Reference Guide help section: 17.1. Examples of Power Syntax, https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v194/cfx_ref/i1308891.html. In a script you could do the following:
  
  1. Put a Point at the maximum X location
  
  2. Get the x,y,z coordinates of the Point
  
  3. Create a plane based on the x,y,z coordinates.
  
  4. Calculate the massflow on the plane.
  
  5. Move to the next timestep and repeat steps 1-5.
  
  Steve
- March 16, 2021 at 8:04 pm
  
  iandcdotnet
  Subscriber
  
  Hello,nI have created a free online flow rate calculator, please check if it could work for you. nThanks for sharing.n