Finding Cells that have temperature and pressure less than a certain value

lablan · October 5, 2016, 08:40

Hello All,

I am running case in which I am using a Metastable thermodynamic property table to enable the fluid to go past the fluid's saturation line. I want to now define an isosurface or some kind of function in order to determine which areas within the CFD domain are going past this line. Does anyone know of a way to use a table of values (such as the saturation line in this case) to set a criteria that highlights any cells that are below the saturation temperature for a certain Pressure?

I know that isosurfaces are very useful to find one value of one variable but I am unsure if it is possible to have two variables as the criteria and instead of one value of the variable, set criteria to highlight anything below one value?

Thanks!!

Lauren

monkey1 · October 5, 2016, 08:45

When you go to "Insert->Location->Volume" in CFX-Post and then select "Isovolume", you can define, that cells above, below or between specified values are drawn.
But you will only be able to this for 1 Variable. If you need 2 Variables maybe you will have to look for 2 Isolvolumes, define a spcific color for each of them and set a transparency, so that you would see cells with overlap of both values....

Or you can define that all cells for a certain temperature window are shown by the isolvolume and the color of the cells/isovolume will be selected due to the coloring variable pressure...instead of giving a fixe colour to the isovolume. in that way you could somehow print 2 variables with one type of visualisation

October 5, 2016, 08:40	Finding Cells that have temperature and pressure less than a certain value	#1
lablan New Member Lauren Blanchette Join Date: Mar 2016 Posts: 9 Rep Power: 10	Hello All, I am running case in which I am using a Metastable thermodynamic property table to enable the fluid to go past the fluid's saturation line. I want to now define an isosurface or some kind of function in order to determine which areas within the CFD domain are going past this line. Does anyone know of a way to use a table of values (such as the saturation line in this case) to set a criteria that highlights any cells that are below the saturation temperature for a certain Pressure? I know that isosurfaces are very useful to find one value of one variable but I am unsure if it is possible to have two variables as the criteria and instead of one value of the variable, set criteria to highlight anything below one value? Thanks!! Lauren

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October 5, 2016, 08:45		#2
monkey1 Senior Member Join Date: Jul 2011 Location: Berlin, Germany Posts: 173 Rep Power: 14	When you go to "Insert->Location->Volume" in CFX-Post and then select "Isovolume", you can define, that cells above, below or between specified values are drawn. But you will only be able to this for 1 Variable. If you need 2 Variables maybe you will have to look for 2 Isolvolumes, define a spcific color for each of them and set a transparency, so that you would see cells with overlap of both values.... Or you can define that all cells for a certain temperature window are shown by the isolvolume and the color of the cells/isovolume will be selected due to the coloring variable pressure...instead of giving a fixe colour to the isovolume. in that way you could somehow print 2 variables with one type of visualisation