Forum: OpenFOAM Running, Solving & CFD
September 29, 2006, 09:23
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Replies: 33
Views: 8,458
Thanks for the offer. Currentl
Thanks for the offer. Currently, we are checking some indeas, that could fix the problems. If we have no success, we will post the case.
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Forum: OpenFOAM Running, Solving & CFD
September 27, 2006, 04:21
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Replies: 33
Views: 8,458
Here are some new results. Now
Here are some new results. Now, we have chosen the same model as before, but
with larger inlet temperature and mass flow (please reference to the first post).
The result of mass flow rate at...
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Forum: OpenFOAM Running, Solving & CFD
September 8, 2006, 01:44
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Replies: 33
Views: 8,458
Meanwhile we have tested the e
Meanwhile we have tested the enthalpy equation without diffusion. However, the changes in mean temperature and pressure are tiny. Thus, thermal diffusion may be negligible. Some other ideas? Thanks!
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Forum: OpenFOAM Running, Solving & CFD
September 7, 2006, 09:14
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Replies: 33
Views: 8,458
Hrv
we wrote our latest ans
Hrv
we wrote our latest answer before we saw your answer.
What do you think about checking your opinion by using the enthalpy equation
solve
(
...
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Forum: OpenFOAM Running, Solving & CFD
September 7, 2006, 08:32
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Replies: 33
Views: 8,458
We have, of course, analysed t
We have, of course, analysed the "near field" of the inlet and compared it with CFX5. There are hardly some differences of temperature, pressure and velocity at inlet. Thus, we tend to assume that...
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Forum: OpenFOAM Running, Solving & CFD
September 7, 2006, 06:27
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Replies: 33
Views: 8,458
Now, we have inserted p.oldTim
Now, we have inserted p.oldTime() in "createFields.H". And in fact, we can see small changes in the spatial pressure and temperature distribution. But unfortunately, the mean vales of temperature and...
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Forum: OpenFOAM Running, Solving & CFD
September 6, 2006, 06:12
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Replies: 33
Views: 8,458
Thank you so much. I have chan
Thank you so much. I have changed the code by using your suggestion. But unfortunately, the result is nearly the same as before.
I'm still thinking the "gamma" plays the key role here. So...
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Forum: OpenFOAM Running, Solving & CFD
September 5, 2006, 06:18
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Replies: 33
Views: 8,458
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Forum: OpenFOAM Running, Solving & CFD
September 4, 2006, 04:00
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Replies: 33
Views: 8,458
Now the situation is that if I
Now the situation is that if I subtract the mean temperature <t> of OpenFoam with 293 and multiply with gamma (gamma=cp/cv), then I get almost the same temperature as in CFX5. So I guess the wrong...
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Forum: OpenFOAM Running, Solving & CFD
September 1, 2006, 09:14
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Replies: 33
Views: 8,458
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Forum: OpenFOAM Running, Solving & CFD
September 1, 2006, 08:42
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Replies: 33
Views: 8,458
The finding is that the enthal
The finding is that the enthalpy flow of OpenFOAM is very close to that of CFX5.
Here, we have checked the static part, mdot*h_static, as well as the kinetic part mdot*uČ/2. Both are the same...
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Forum: OpenFOAM Running, Solving & CFD
August 31, 2006, 04:04
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Replies: 33
Views: 8,458
You are right! My incorrect po
You are right! My incorrect postprocessing calculation introduced the error. Now mass is conserved. But there are still problems during the simulation that make temperature and pressure smaller than...
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Forum: OpenFOAM Running, Solving & CFD
August 31, 2006, 03:41
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Replies: 33
Views: 8,458
Yes, your idea turned out to b
Yes, your idea turned out to be correct! I have checked the (m-m0) again by using your proposal m = V/R {p/T}, the mass is now conserved. Thanks a lot! But any idea about the pressure and Temperature?
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Forum: OpenFOAM Running, Solving & CFD
August 30, 2006, 08:24
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Replies: 33
Views: 8,458
The system mass is calculated
The system mass is calculated by using pV=mRT, p and T are the mean values within the volume. Then I get the mass(m) value for each saved step, subtract the initial mass m0.
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Forum: OpenFOAM Running, Solving & CFD
August 30, 2006, 07:26
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Replies: 33
Views: 8,458
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Forum: OpenFOAM Running, Solving & CFD
August 30, 2006, 06:46
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Replies: 33
Views: 8,458
Hello,
I ran my case with b
Hello,
I ran my case with both OpenFoam (sonicTurbFoam) and CFX5 and compared
results by generating graphs of temperature, pressure, mass and mass flow rate
as well as some contour...
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