Calculate the unburnt char in a CFX coal combustion calculation

- September 27, 2017 at 11:19 am
  
  admin
  Ansys Employee
  
  How do you calculate the unburnt char in a CFX coal combustion calculation?
- October 17, 2017 at 5:46 am
  
  admin
  Ansys Employee
  
  •Please start the calculation with the option Output Control -> Results -> Extra Output Variables List •Choose one variable for every Particle group you defined. •Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. •You can evaluate the mass flow of the particles within your domain similar to the Eulerian phase variables. •In ANSYS CFX please do the following (assuming HC Fuel as particle material name): •Generate an Expression CharMassflowCalc = HC Fuel.Mass Flow * HC Fuel.Char.Mass Fraction •Generate a variable referencing the Expression: Char Mass flow = CharMassflowCalc •Create a plane where you want to calculate the massflow •Bound the plane if necessary (Plane definition -> Geometry tab -> Plane Bounds) •You can set the center of the bounding box if the plane is set by three points •The first point specifies the center. •Sum up the variable Char Mass flow over the plane: sum(Char Mass flow)@plane 1