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-   -   Plotting Concentration Envelope of a Gas mixture in StarCCM+ (https://www.cfd-online.com/Forums/star-ccm/233276-plotting-concentration-envelope-gas-mixture-starccm.html)

 Marcel95 January 20, 2021 04:28

Plotting Concentration Envelope of a Gas mixture in StarCCM+

Hello there,

I investigate a mixture of two gases, more detailed there is a freejet of Hydrogen in still ambient air. I calculated the simulation and want to compare the results with some extern experimental data.

Question:
Is there a possibility in StarCCM+ that i can choose for example a mass-concentration of 20% H2 and StarCCM+ shows me the concentration envelope line around the jet centerline where exactly the 20% mass concentration is given in the simulation?

I know the function of choosing "mass fraction H2" Displayer in the scalar scene, applied on a cut section. I can see the concentration therein form of different colors. But i want to see an concentration envelope of x% as a single shape.

 ping January 20, 2021 10:06

i think what you are asking for is called an iso-surface type of derived part in star - this gives a nice smooth surface of all places where say x% occur of some scalar and looks like a cloud.
another option is a threshold but this will show a subset of all the cells with some range of the scalar concentration - not a pretty but very useful in many situations.

 Marcel95 January 21, 2021 05:47

Quote:
 Originally Posted by ping (Post 793848) i think what you are asking for is called an iso-surface type of derived part in star - this gives a nice smooth surface of all places where say x% occur of some scalar and looks like a cloud. another option is a threshold but this will show a subset of all the cells with some range of the scalar concentration - not a pretty but very useful in many situations.
Thank you very much, i got it :-)

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