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Hypersonic and Supersonic Flow Solvers

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Old   May 30, 2020, 09:59
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  #21
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Vince
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Hi,


No, v1706 is the only version that can be used.


Thanks,
Vince
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Old   November 4, 2020, 08:26
Default Equilibrium constant calculation
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Alexander Nekris
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Hello Vincent,

first of all I would like to say that I like your work very much. I have written a similar solver but in a very light and immature version (compared to your project). My programming skills are unfortunately quite modest. My solver is based on sonicFoam instead of rhoCentralFoam, I wrote it based on foam-extend-4.0 and I use 3-temperature model for thermal non-equilibrium. I am not allowed to publish my solver yet. Besides, a lot of its parts are hard coded, which makes it rather user-unfriendly at the moment.

I am currently testing your hy2Foam solver. I have a question regarding chemistry. As I have seen in the chemical mechanisms in the hy2Foam tutorials, you calculate the forward reaction rate constant (k_f) in m^3/(kmole*s). Then you calculate the equilibrium constant K_eq by using the curve-fit coefficients in order to calculate k_b. But the unit of k_b can vary depending on the reaction. For example, the backward constant remains in m^3/(kmole*s) for such reactions as NO + O = O2 + N. This means that K_eq is in this case dimensionless. For reactions of type AB -> A + B, such as N2 + M = 2N + M, k_b is in m^6/(kmole^2*s). In this case K_eq is no longer dimensionless and gets the following dimensions: m^3/(kmole*s). Since the Arrhenius coefficients are mostly given in cm^3/(mole*s) or cm^6/(mole^2*s), you have to multiply K_eq by 1000 for the reactions of the type AB -> A + B in order to convert K_eq from CGS units to MKS units.
My question is: where does it happen in the source code?
Or did I make a mistake? Not sure, which is why I didnít want to make a bug report.
Thanks in advance.

Kind Regards

Alexander
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Old   December 15, 2020, 13:17
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Vince
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Hi Alexander,


Thanks for your interest!
You did well by opening on Issue on hyStrath, I prefer when all questions are centralised there.


https://github.com/vincentcasseau/hyStrath/issues/59



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Vincent
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Old   March 9, 2021, 18:48
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Hello Vincent,

I am interested to do hypersonic simulations in OpenFoam. Thank you very much for your work on this, much appreciated. I tried to follow your links provided above:

- source code: https://github.com/vincentcasseau/hyStrath
- Wiki page: https://github.com/vincentcasseau/hyStrath/wiki

But they seem outdated. Is this solver still publicly available and would you please update.

Also, would this solver pair with the EOF-library: https://github.com/jvencels/EOF-Library, so that coupling to ELMER (https://www.csc.fi/fi/web/elmer) would be possible?

Thank you,
Andreas
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Old   March 9, 2021, 19:28
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Hi Andreas,


The links are as follows now:



- source code: https://github.com/vincentcasseau/hyStrath (unchanged)

- website: https://vincentcasseau.github.io/ (replaced the Wiki)



I was not aware Elmer could be coupled to OpenFOAM. The solvers on hyStrath are no different from the OF ones so there is a chance it may work. If you are interested, please give it a try and open an Issue on hyStrath in case of conflicts.



Regards,
Vincent
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Old   March 11, 2021, 12:47
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Hi Vincent,

Thank you for your quick reply, much appreciated. We will try out hyStrath.

I have been doing some more digging and it seems Elmer is a great tool, but not directly suited for antenna simulations. What I am essentially interested in is plasma-RF interactions.

openEMS seems to be the right tool for antenna simulations: https://openems.de/start/ and can do bent patch antenna analysis: https://openems.de/index.php/Tutoria...h_Antenna.html, and the coupling can be one-way: hyStrath-->openEMS for example, unless you have a better suggestion for antenna simulations? I see you have done some work in MHD, but MHD problems are typically different from antenna problems.

Any useful information is appreciated.

Thank you!
Andreas
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Old   March 14, 2021, 22:52
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Vince
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Hi Andreas,


Thanks for the short description and the links.
Unfortunately, I can't provide any advice about antennas.


Regards,
Vincent
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