# Flowsight Visualisation - Pressure Difference

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 July 31, 2014, 03:57 Flowsight Visualisation - Pressure Difference #1 New Member   John Chesterton Join Date: Jan 2014 Posts: 5 Rep Power: 12 For various reasons, i'd like to create a visualisation of the pressure in my model compared to the static pressure at any point for its corresponding free surface level. So, what I'd like to do is write an expression something like: Pressure difference = Static Pressure - Modelled Pressure Where: Static Pressure = FreeSurfaceElevation - Z coordinate at that point Modelled Pressure = Modelled Pressure in m of head I've struggled for some reason - any ideas? I'd settle for simply being able to use the z coordinate in the equation and assume a static water level if that's possible.

 August 13, 2014, 13:30 #2 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17 You should be able to do this with the Calculator feature in FlowSight (comes with v11). First you have to have the free surface elevation added to the output: before you run, turn on Model Setup > Output > Additional output > Hydraulic data. In FlowSight: Load the output file. Click on the Calculator icon in the upper left corner. Switch to the "Build your own functions" tab Give the variable a name Enter the desired expression using the variables from the list and the keypad on the dialog Select all of the mesh blocks to define the "selected parts". Choose "Evaluate for selected parts". When you define the variables, define each variable sequentially using the previously calculated variables. FlowSight doesn't like doing certain commands at the same time as others. For example, define the z-coordinate (zc), then define the static pressure (ps) using the calculated z-coordinate, then the modeled pressure (pm), and finally the pressure difference (dp). When you go to create the variable, select all of your mesh blocks as the parts to be used for the evaluation.

 Tags ensight vizualisation, flow 3d, flowsight, visualisation

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