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How to use hydraulic fluid as material in CFX?

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Old   December 6, 2007, 13:09
Default How to use hydraulic fluid as material in CFX?
  #1
fat bug
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I'm using water right now. and I don't see Hydraulic fluid as an option. Does it make a difference? If so, where can I get the material property? Thanks!
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Old   December 6, 2007, 13:15
Default Re: How to use hydraulic fluid as material in CFX?
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opaque
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I guess you know the hydraulic fluid you are working with. I mean the SAE (or other standard) specifications to it.

The specification will tell you the properties the material must have. Then, you create a new material in CFX, and input the data in the different slots.

Not all hydraulic fluids are the same.

Opaque

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Old   December 6, 2007, 13:24
Default Re: How to use hydraulic fluid as material in CFX?
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fat bug
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I heard you can download material property for specific material somewhere. Any body done that?

I can certainly try set one up for myself.

Thanks for the advice!
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Old   December 6, 2007, 18:13
Default Re: How to use hydraulic fluid as material in CFX?
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Glenn Horrocks
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Hi,

There is a huge range of viscosities in oils depending on the grade you are using. The other properties only change a little but viscosity changes enormously. Whether it is important to have the exact material properties is problem dependant, but you might as well do the best you can to get the correct properties.

First find the grade of oil you are modelling then contact the technical support people from Mobil/Caltex/Who ever supplies the oil. They will have all the standard properties like density, viscosity (don't forget to evaluate viscosity at the temperature you are running at, and if a range of temperatures you need a variable viscosity model). Their websites have some information but I usually contact their tech support people as they have a lot more information than is on the website.

If you are doing more advanced modelling like cavitation then good luck! Getting the more advanced properties for these type of modelling is very difficult.

Glenn Horrocks
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