[chryzler]

Hello,

I am simulating a flow through a pipe in ANSYS CFX. I am particular interested in the pressure drop.

Up to present I post-processed as follows:
1. I create a location (Line) through the pipe (through the origin)
2. I create a diagram that displays the pressure along this line vs. the position.

How ist it possible to create a diagram displaying the area average pressure vs. the position?

I could not figure it out. The only way I found it could work is, when I create planes and use expressions to calculate the average pressure at every plane. Then I would use the results of those expressions and create the diagram.

Hopefully there is faster way, that I just did not found yet.

Thank you in adavance.

Christoph

[chryzler]

In a workshop I found a way to this. Save it as a .cse File und play it as a session in CFD-Post. Of course you need to edit the plane information and the coding at the end.

# generate area average volume fractions as a function of axial position

# open output file for data
!open OUT,"> vfrac.csv";

#print header info

!print OUT "Vapour.Volume Fraction [m^3/m^3], z [m]\n";
 
PLANE:Plane 1
  Apply Instancing Transform = On
  Apply Texture = Off
  Blend Texture = On
  Bound Radius = 0.5 [m]
  Colour = 0.75, 0.75, 0.75
  Colour Map = Rainbow
  Colour Mode = Variable
  Colour Scale = Linear
  Colour Variable = Pressure
  Colour Variable Boundary Values = Hybrid
  Culling Mode = No Culling
  Direction 1 Bound = 1 [m]
  Direction 1 Orientation = 0 [degree]
  Direction 1 Points = 10
  Direction 2 Bound = 1 [m]
  Direction 2 Points = 10
  Domain List = All Domains
  Draw Faces = On
  Draw Lines = Off
  Instancing Transform = Default Transform
  Invert Plane Bound = Off
  Lighting = On
  Line Colour = 0, 0, 0
  Line Colour Mode = Default
  Line Width = 1
  Max = 0 [Pa]
  Min = 0 [Pa]
  Normal = 1 , 0 , 0
  Option = XY Plane
  Plane Bound = None
  Plane Type = Slice
  Point = 0 [m], 0 [m], 0 [m]
  Point 1 = 0 [m], 0 [m], 0 [m]
  Point 2 = 1 [m], 0 [m], 0 [m]
  Point 3 = 0 [m], 1 [m], 0 [m]
  Range = Global
  Render Edge Angle = 0 [degree]
  Specular Lighting = On
  Surface Drawing = Smooth Shading
  Texture Angle = 0
  Texture Direction = 0 , 1 , 0
  Texture File =
  Texture Material = Metal
  Texture Position = 0 , 0
  Texture Scale = 1
  Texture Type = Predefined
  Tile Texture = Off
  Transform Texture = Off
  Transparency = 0.0
  X = 0.0 [m]
  Y = 0.0 [m]
  Z = 0.02 [m]
  OBJECT VIEW TRANSFORM:
    Apply Reflection = Off
    Apply Rotation = Off
    Apply Scale = Off
    Apply Translation = Off
    Principal Axis = Z
    Reflection Plane Option = XY Plane
    Rotation Angle = 0.0 [degree]
    Rotation Axis From = 0 [m], 0 [m], 0 [m]
    Rotation Axis To = 0 [m], 0 [m], 0 [m]
    Rotation Axis Type = Principal Axis
    Scale Vector = 1 , 1 , 1
    Translation Vector = 0 [m], 0 [m], 0 [m]
    X = 0.0 [m]
    Y = 0.0 [m]
    Z = 0.0 [m]
  END
END

!$i = i;

!while ($i < 100) {
! $z = 0.02*$i;

PLANE:Plane 1
  Z = $z [m]
END

!$avevfrac = areaAve("Vapour.Volume Fraction","Plane 1");
!print OUT "$avevfrac, $z\n";
!$i++;
!}
!close (OUT);