[Dessrt's Bilure]

Hello everyone,


I try to find the expert parameter:"monitor raw tt data" in expert parameters tab, in CFX-Pre but I cannot. Do anyone know where this parameter is?


The reason why I am looking for it is the message that I received from the solver:
+--------------------------------------------------------------------+
| ERROR #002100086 has occurred in subroutine SU_DEPENDS_ON. |
| Message: |
| For the Time Transformation model, results of expressions involving|
| averaging or integration of solution variables over surfaces and |
| volumes are in transformed space and cannot be directly related to |
| physical space results. To avoid misinterpretation, using or |
| reporting these quantities is not allowed. You can allow this by |
| setting the expert parameter: "monitor raw tt data = t". |
+--------------------------------------------------------------------+



I am starting to believe that this parameter is actually a group of parameters. So I tried different combinations but without results.



Thanks in advance

[ghorrocks]

Many (in fact most) of the expert parameters are only available through CCL. In CFX-Pre generate a Expert Parameter block by adding any old expert parameter, then right click on the Expert Parameter block in the tree and select "Command Editor" (I think that is the option). You then get a text editor where you can change your dummy expert parameter to the one you really want.

[Dessrt's Bilure]

Thanks it works!!! It was exactly as you said. I felt like a hacker

[ghorrocks]

Ha ha, I had never thought of it that way.

Also make sure you understand what the original error message was saying. CFX had disabled calculating those values for a reason, so if you go and calculate them anyway you need to be aware of the implications. That is why it is called an "Expert Parameter".

[Dessrt's Bilure]

I understand what you are saying. I am new in the field so I do not have this level of knowledge yet.



Do you have any books or other sources to suggest me to read? I am reading "Computational Fluid Dynamics: A practical Approach" now

[ghorrocks]

For this specific issue you need to read the CFX documentation on the TTF approach so you know what it is doing. Hopefully you will also be able to work out why integrated and averaged quantities can be misleading - and then you will be able to know whether using the expert parameter is a good idea or not.

The CFX documentation also has some references and there might be some for the TTF approach. I would read them too.

By the way, I have never used the TTF approach in my work and know little about it. So I cannot answer your questions, I just know what I would do if I did have to use it.

[Dessrt's Bilure]

I see. It was the first time I used TTF approach. And as you said something should be wrong with that one. I used Fourier Transformation and these was no problem at all.