Error in defining expression
 

Hi,

I am defining an expression, but i have a error as follows:



Why does this happen?

Thanks.

What does this mean? )(
try )*( multiplication if this is what you want?

Yes!!! Thanks:)

Hi,

Why does the following error happen?




I want to define gas constant of air.

Why does unit of the following expression equal to Kg^2 m s^-5 K^-2?

volumeInt(((Thermal Conductivity/(Temperature)^2)*((1/(Density*(R/(M air))))*(Pressure.Gradient X)^2+(1/(Density*(R/M air)))*(Pressure.Gradient Y)^2+(1/(Density*(R/M air)))*(Pressure.Gradient Z)^2)))@Rotary

http://www.upsara.com/images/dwvw_5555555555555.jpg

R=gas constant


According to above, Unit of Volume integral should be equal to kg m^2/S^-3 K^-1 . I assumed fluid as ideal gas presently. therefore>>>>> P=Ro*R*T

T=P/(RO*T)

.........


Thanks.

I dont think that [Kj] means enithing.
definitly not with smal j

I am asking the experts now-> (is kilo(k) , mega(M) and other prefixes suported instead of multipliers) as I havent tried it out myself.

Joul=J should work but than, for Kilo you should multiply it by 1000.
so you would end up with [J kg^-1 K^-1]*1000

Yes, CFX supports the SI unit system with prefixes. But you have to get it correct, as urosgrivc states. Joule is J and kilo prefix is k, so the unit if kJ.

Thanks.

What is your suggestion about defining expression?

I am grateful that guide me about this case.

I think the temperature gradient functions work in CFD-Post. Have a look in the CFX reference manual for a description of the available variables and functions you can apply to them.

Also the temperature gradient variables will be available under the puzzlingly titled "..." button for plotting on surfaces, vectors etc.

Thanks.

I don't understand this your statement. Can you explain more?

What is "..." button?

Insert an User Defined Variable, for the method select Gradient, and select Temperature for the variable. CFD-Post will create the Temperature.Gradient variable.

You can then use it as needed.