[Iniesta8]

Hello all,
I am new to SU2. And I want to use it to do a simulation of a hypersonic cylinder flow with a catalytic wall boundary condition. I can only get the total wall heat flux now, but the diffusion heat flux is also important. So anyone knows how to output the diffusion heat flux? And if possible, I also want to output the thermal conductivity, diffusion flux, and total enthalpy fields.
Any help will be appreciated.

[PENGGEGE777]

Just read SU2_CFD/src/output/CFlowCompOutput.cpp, learn how Pressure is output.



Then you can modify the code and output anything you want.


Best wishes.

[Iniesta8]

Originally Posted by PENGGEGE777

Just read SU2_CFD/src/output/CFlowCompOutput.cpp, learn how Pressure is output.



Then you can modify the code and output anything you want.


Best wishes.

Thanks, I will have a try.

[bigfootedrockmidget]

see also https://github.com/su2code/SU2/pull/1889

[Iniesta8]

Originally Posted by bigfootedrockmidget

see also https://github.com/su2code/SU2/pull/1889

Yes, I have seen it. Thanks for your efforts.

[Iniesta8]

Originally Posted by bigfootedrockmidget

see also https://github.com/su2code/SU2/pull/1889

BTW, if I want to output other variables in the future. Emm... ,maybe something not most users needed, like gamma, Cv, Cp. Just add codes in CNEMOCompOutput.cpp to call functions AddVolumeOutput() and SetVolumeOutputValue() and then rebuild. Is it right?

[bigfootedrockmidget]

yes, if the variable can be retrieved from Node_Flow, you do this in SetVolumeOutputValue:

Cp: Node_Flow->GetSpecificHeatCp
 Cv: Node_Flow->GetSpecificHeatCv

Gamma is not stored in node_flow, so you'll have to get it from Cp and Cv.

For development, I recommend using vscode. It also has autocomplete, so if you type

Node_Flow->

then it will give you a list of all functions, so you immediately see that

Node_Flow->GetSpecificHeatCp

is an existing function.


EDIT: the available variables depend on the solver, not every solver has the same functionality

[Iniesta8]

Originally Posted by bigfootedrockmidget

yes, if the variable can be retrieved from Node_Flow, you do this in SetVolumeOutputValue:

Cp: Node_Flow->GetSpecificHeatCp
 Cv: Node_Flow->GetSpecificHeatCv

Gamma is not stored in node_flow, so you'll have to get it from Cp and Cv.

For development, I recommend using vscode. It also has autocomplete, so if you type

Node_Flow->

then it will give you a list of all functions, so you immediately see that

Node_Flow->GetSpecificHeatCp

is an existing function.

Yes, I am using vscode. Your suggestion is very useful for me, thanks.

[wallym]

Hi All,

In NEMO, gamma is stored in at the node level and can be accessed via:
"Node_Flow->GetGamma(iPoint)"

On the other hand the Cp and Cv functions do not exist

[Iniesta8]

Originally Posted by wallym

Hi All,

In NEMO, gamma is stored in at the node level and can be accessed via:
"Node_Flow->GetGamma(iPoint)"

On the other hand the Cp and Cv functions do not exist

Hi Wally,
Thanks for the reminder. So that's the point. For I just found that when I add Cp and Cv in the outputs it always returns a zero constant flowfield.

[Iniesta8]

Originally Posted by wallym

Hi All,

In NEMO, gamma is stored in at the node level and can be accessed via:
"Node_Flow->GetGamma(iPoint)"

On the other hand the Cp and Cv functions do not exist

Hi Wally
When I use "Node_Flow->GetGamma(iPoint)" to get Gamma. It reminds me that "class "CVariable" has no member "GetGamma". Then I add GetGamma() in CVariable.hpp via
"inline virtual su2double GetGamma(unsigned long iPoint) const { return 0.0; }"
"inline virtual void SetGamma(unsigned long iPoint, su2double Gamma) {}"
But it doesn't work. The Gamma in output is always 0.

[wallym]

Hmmm,
The GetGamma function (for your use) is only defined in the NEMO solver:
" /*!
* \brief Returns the stored value of Gamma at the specified node
*/
inline su2double GetGamma(unsigned long iPoint) { return Gamma(iPoint); }
"

[bigfootedrockmidget]

Yes, It's a bit confusing because GetGamma() is part of the CNEMOEulerVariable class, but in the NEMO output, the flow_nodes belong to CVariable, so it's a bit more complicated than simply adding 2 lines.

[Iniesta8]

Originally Posted by bigfootedrockmidget

Yes, It's a bit confusing because GetGamma() is part of the CNEMOEulerVariable class, but in the NEMO output, the flow_nodes belong to CVariable, so it's a bit more complicated than simply adding 2 lines.

Hi
Could you give me some tips to allow GetGamma() used in NEMO output?