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Problems for Stepped Spillways Modelling

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Old   May 29, 2016, 13:14
Default Problems for Stepped Spillways Modelling
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Sayed-Abdol-Hamid Sajjadi
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Dear all
what models must be activated for investigating the influence of 1. Void Fraction 2. bubbles 3. Cavity length ?
i activated these models but it does NOT generate good results :
Air entrainment
Density evaluation
Drift-flux
Gravity
Surface tension
Viscosity
thank you
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Old   July 20, 2016, 11:14
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kaouachi anouar
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Hello Dear are you successful for simulation of water over stepped spillways ? we can cooperate for this simulation
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Old   July 29, 2016, 00:52
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Yu Zhou
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Quote:
Originally Posted by luca007 View Post
Hello Dear are you successful for simulation of water over stepped spillways ? we can cooperate for this simulation

How we cooperate? I also do this.
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Old   July 30, 2016, 19:24
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thank you so much for your reply im phd student i want make Scientific article about the flow over stepped spilways Using cfd ?
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Old   July 31, 2016, 22:48
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Originally Posted by luca007 View Post
thank you so much for your reply im phd student i want make Scientific article about the flow over stepped spilways Using cfd ?

i am the same as you
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Old   August 1, 2016, 08:46
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kaouachi anouar
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So can you send my your email?
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Old   August 2, 2016, 04:21
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Yu Zhou
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So can you send my your email?

my email:flow3d@yeah.net
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Old   August 2, 2016, 12:23
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Daniel Valero
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Dear Sayed (et al.),
you can find some description on models used for this type of simulation under the following link:

http://89.31.100.18/~iahrpapers/80300.pdf

There is also some discussion on the results: air entrainment, free surface roughness and velocity profiles.

Best regards,
D.
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Old   August 5, 2016, 10:55
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Sayed-Abdol-Hamid Sajjadi
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Quote:
Originally Posted by Davahue View Post
Dear Sayed (et al.),
you can find some description on models used for this type of simulation under the following link:

http://89.31.100.18/~iahrpapers/80300.pdf

There is also some discussion on the results: air entrainment, free surface roughness and velocity profiles.

Best regards,
D.
Thank you dear Davahue for your reply.
actually i simulated the stepped spillway before and i extracted the results too, but my problem is a big deviation between the experimental and numerical data.
the maximum values of spillway volume is 1 m , 1.4 m and 1.4 m on a Cartesian axis and i assume a 2.6* 1.6*1 m^3 mesh block using 0.5 to 1 cm mesh size for modelling , if you are curious about that.
i had to plot the air entertainment into the fluid flow over the spillway and i calculate that by fraction of fluid. when i compare the figures with the experimental figures, there is a deviation unfortunately.
i will be grateful if you share your experience with me.
thank you.
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Old   August 6, 2016, 07:15
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Daniel Valero
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Dear Sayed,
my experience is: when using FLOW-3D's air entrainment model, you can reproduce the inception point location as shown in the above posted paper or in Bombardelli et al (2011). If you are interested in the velocity profiles, these 2 papers show also some comparison, and the one posted above also discusses on the free surface roughness.

If you want to reproduce accurately the air concentrations, you will have to do some calibration of C_{air}, this is also discussed in the above posted paper. If you want to get some more ideas on this type of calibrations, I carried out one for smooth spillways a few years ago which you can find in my Research Gate profile.

Best regards,
Daniel
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Old   August 6, 2016, 17:04
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Quote:
Originally Posted by Davahue View Post
Dear Sayed,
my experience is: when using FLOW-3D's air entrainment model, you can reproduce the inception point location as shown in the above posted paper or in Bombardelli et al (2011). If you are interested in the velocity profiles, these 2 papers show also some comparison, and the one posted above also discusses on the free surface roughness.

If you want to reproduce accurately the air concentrations, you will have to do some calibration of C_{air}, this is also discussed in the above posted paper. If you want to get some more ideas on this type of calibrations, I carried out one for smooth spillways a few years ago which you can find in my Research Gate profile.

Best regards,
Daniel
Thank you dear Daniel for your helpful answer.
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Old   August 7, 2016, 20:54
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Yu Zhou
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Quote:
Originally Posted by Davahue View Post
Dear Sayed,
my experience is: when using FLOW-3D's air entrainment model, you can reproduce the inception point location as shown in the above posted paper or in Bombardelli et al (2011). If you are interested in the velocity profiles, these 2 papers show also some comparison, and the one posted above also discusses on the free surface roughness.

If you want to reproduce accurately the air concentrations, you will have to do some calibration of C_{air}, this is also discussed in the above posted paper. If you want to get some more ideas on this type of calibrations, I carried out one for smooth spillways a few years ago which you can find in my Research Gate profile.

Best regards,
Daniel

thanks daniel. I will read them carefully.
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