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-   -   Shocks at Re 100 (https://www.cfd-online.com/Forums/main/125354-shocks-re-100-a.html)

Karan October 23, 2013 21:09

Shocks at Re 100
 
Hi,

Does anybody know of any physically possible flow at Reynolds number between 100-200 and has shock waves or is compressible ?
Is it possible in compressors or gas turbines ?

thanks

FMDenaro October 24, 2013 05:51

Quote:

Originally Posted by Karan (Post 458642)
Hi,

Does anybody know of any physically possible flow at Reynolds number between 100-200 and has shock waves or is compressible ?
Is it possible in compressors or gas turbines ?

thanks

your fluid is air? how about velocity and temperature?

agd October 24, 2013 08:44

And what length scale are you using for the Reynolds number?

FMDenaro October 24, 2013 08:47

Quote:

Originally Posted by agd (Post 458777)
And what length scale are you using for the Reynolds number?

I think he was asking for compressor or turbine therfore I assumed the lenght is not so small, at least O(10^-1) meter ... but I can be wrong

FMDenaro October 24, 2013 08:49

Just to clarify my opinion, I think that for real fluid (i.e., not-vanishing viscosity) there is never a schock wave if we consider that as same as the singularity developed in case of ideal gas (inviscid flow).

The Re number governs the width of the "shock layer", a zone of deep gradient but with regular solution

agd October 24, 2013 12:53

I think your assumption is a reasonable one, but the OP is somewhat confusing to me. I'm trying to imagine a turbine or compressor where the operating Re is so small. That's why I asked.


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