defining Material

mactech001 · March 26, 2010, 00:16

Dear all,

i would like to define a new material in CFX-Pre. Using the defined 'Water', i changed the density,specific heat capacity, conductivity and viscosity for Water-Glycol mixture.

In the help, it mentions that the Reference State under 'Material Properties' page has to be defined.

i have only the properties mentioned above under certain temperatures, but no pressure-dependent values. Can i UNTICK this Reference State please? will it effect my results?

look forward to hear of any comments.

JDA · April 21, 2010, 15:32

Water-glycol is nearly incompressible in most applications. You should be fine entering some reasonable pressure as a reference pressure for the quantities you changed. Also, the reference pressure prompt may be indicating that you have left the reference pressure for the domain empty.

It may be wise to create a new user material "water-glycol" instead of editing "water." This will let you know that the properties for water are correct and you don't need to verify every time you reference the material.

March 26, 2010, 00:16	defining Material	#1
mactech001 Senior Member Join Date: Nov 2009 Posts: 125 Rep Power: 16	Dear all, i would like to define a new material in CFX-Pre. Using the defined 'Water', i changed the density,specific heat capacity, conductivity and viscosity for Water-Glycol mixture. In the help, it mentions that the Reference State under 'Material Properties' page has to be defined. i have only the properties mentioned above under certain temperatures, but no pressure-dependent values. Can i UNTICK this Reference State please? will it effect my results? look forward to hear of any comments. __________________ Thank you for your kind attention. Kind regards, mactech001 Currently using: ANSYS v13

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April 21, 2010, 15:32		#2
JDA New Member J. D. Aurand Join Date: Apr 2010 Posts: 13 Rep Power: 16	Water-glycol is nearly incompressible in most applications. You should be fine entering some reasonable pressure as a reference pressure for the quantities you changed. Also, the reference pressure prompt may be indicating that you have left the reference pressure for the domain empty. It may be wise to create a new user material "water-glycol" instead of editing "water." This will let you know that the properties for water are correct and you don't need to verify every time you reference the material.