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Query Regarding Floating Cylindrical Buoy Simulations with Reef3D |
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#1 |
Member
Bhargav
Join Date: Aug 2022
Posts: 30
Rep Power: 4 ![]() |
Hello Reef3D Team,
I've been working on 3D numerical simulations involving a floating cylindrical buoy, both with and without a turbulence model. When I conducted the simulation without the turbulence model, it ran smoothly without any errors, but the over predictions by approximately 10% when compared to experimental results. However, when I attempted to run the simulation with the turbulence model enabled, I encountered a problem. The simulation abruptly terminated around the 12.6-seconds, and I received an error message stating, "velocities exceeding critical value N 61 (default value I am using)." Strangely, I did not observe any sudden spikes in the heave plot during this time. Could you please provide insights into the possible reasons behind this issue? Thank you in advance for your assistance. |
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#2 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 396
Rep Power: 18 ![]() |
Please try the latest RC, you problem should be fixed.
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#3 |
New Member
HCMC
Join Date: Aug 2023
Posts: 22
Rep Power: 3 ![]() |
Dear Sir,
I would like to attach my simulation of a floating cylinder with moorings. Although it ran successfully but from time step 40 the cylinder seemed to sink forever. Can you help me know why or give me some advice about this. Thanks in advance. Best regardscontrol.txt ctrl.txt Cylinder.jpg |
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#4 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 396
Rep Power: 18 ![]() |
Are you using the latest RC?
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#5 |
New Member
HCMC
Join Date: Aug 2023
Posts: 22
Rep Power: 3 ![]() |
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#6 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 396
Rep Power: 18 ![]() |
Like I said in my reply from September 10th, you need to use the latest RC. If the issue still persists, I will have a look.
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#7 | |
New Member
HCMC
Join Date: Aug 2023
Posts: 22
Rep Power: 3 ![]() |
Quote:
I am using the latest RC. The issue still persists and the wave looks so strange. Could you please have a look. Thank you ever so muchcontrol.txt ctrl.txt |
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#8 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 396
Rep Power: 18 ![]() |
The case works for me with the latest RC (running to 200 itereations).
Keep in mind: 23.08 is not the RC - it is the latest master release. The RC (release candidate) can be found here: https://github.com/REEF3D/REEF3D/tree/release_candidate Other comments: - you are missing the relaxation zone length command (B 96) - the wave tank should be ca. 2x still water depth - with floating, I would not start with I 30 1 - for waves + RANS turbulence model, you need T 36 2 for free surface turbulence damping. For this case, no turbulence model would be also an option. |
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#9 |
New Member
HCMC
Join Date: Aug 2023
Posts: 22
Rep Power: 3 ![]() |
Thank you for your reply. I will try to fix this after coming back from the field trip. Best regards
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#10 |
New Member
HCMC
Join Date: Aug 2023
Posts: 22
Rep Power: 3 ![]() |
Hello Reef3D Team,
Instead of using the X312 command I want to use the X311 command. However, I do not know how to declare the range of three parameters H, P and Q properly. Could you please provide some more detail for this issue? Because if using the X311 command, which option must be enabled for X310? Thank you in advance for your assistance. Last edited by TrungPham; November 29, 2023 at 22:22. |
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#11 | |
New Member
Ahmet Soydan
Join Date: Jun 2015
Location: Trondheim, Norway
Posts: 25
Rep Power: 12 ![]() |
You can check this thread
X 311 -mooring line configuration Quote:
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