[Hamda]

Hi,
I want to define the following equation for energy source:
410040 [W m^-3]*((t^-0.0639 )- (35424000+t)^-0.0639)

My problem is that since CFX is so sensitive to dimension I have to rewrite the equation like this:
410040 [W m^-3 s^0.0639]*((t^-0.0639 )- (35424000[s]+t)^-0.0639)
But I still can't run and get error.

It should be mentioned that in the equation, time is considered without dimension. I mean in the equation just the magnitude of time is important.

I got these messages:
In Analysis 'Flow Analysis 1' - Domain 'Solid': Transient analyses require that initial conditions are specified unless an Initial Values file is specified at run-time.
In Analysis 'Flow Analysis 1' - Output Control: No intermediate transient results files have been defined.

[ghorrocks]

Don't use the variable "t" as your non-dimensional time. It is already defined as the normal dimensional time so you are clashing with that variable definition. Give it a unique name.

Your error messages say nothing about that CEL expression. They are talking about a missing initial condition and transient results files.

[Hamda]

Thank you for swift reply.
I think I should do that and give another name. But there is a problem here. I want to do a transient simulation and so energy should be defined as a function of time.

Yes the error is not related to CEL. I solved it by specifying initial values.



Many thanks

[ghorrocks]

You can use your function, you just have to give your time variable a unique name. Something like "NonDimensionalTime" is a good choice, but you can call it "safgxxzasgasdfg" if you like. Anything which does not clash with existing variable names.