[kg_059]

Hey everyone,

where can i find the properties of the cfx water material and what are the differences between the different water materials that can be accesed via advanced settings?
I have searched the documentation but have not found anything...

Thanks in advance for your help :-)

[Opaque]

Originally Posted by kg_059

Hey everyone,

where can i find the properties of the cfx water material and what are the differences between the different water materials that can be accesed via advanced settings?
I have searched the documentation but have not found anything...

Thanks in advance for your help :-)

That information can be read when opening the "material" in CFX-Pre.

You should see a grouping structure the material belongs to, and a short description such as "Water (saturated vapor) at 100C" or "Water Vapor Ideal Gas (100C and 1 atm)".

Other more elaborate methods treat water as a "real gas", i.e., use a non-ideal equation of state.

[ghorrocks]

The most accurate water material model is the IAPWS model. It is an empirical model for water, covering all phases and a very wide range of temperatures and pressures. It uses complex empirical fits to define the materials properties which the user does not control so it is a little bit of work to actually get what properties it is giving you. If you actually want to see the equations which make up part of the IAPWS model you should look at the web site for the model: https://www.iapws.org/relguide/IF97-Rev.html

Note that water is the only chemical which has a super-accurate material model for all properties for all regimes built into CFX.

[kg_059]

Originally Posted by Opaque

That information can be read when opening the "material" in CFX-Pre.

You should see a grouping structure the material belongs to, and a short description such as "Water (saturated vapor) at 100C" or "Water Vapor Ideal Gas (100C and 1 atm)".

Other more elaborate methods treat water as a "real gas", i.e., use a non-ideal equation of state.

Thank you for the input, also to glenn!

What do you mean by opening the material? This might be a stupid question but i dont see the exact properties when i click on the water model

[ghorrocks]

That is the domain tab. That is where you define the properties for that domain, including what material it is composed - but you cannot see the details of the material.

The details of the material are in the materials tab, a bit further down the tree.

[kg_059]

oh... ooooh

thank you for helping me with that stupidly simple problem

i should get some sleep...