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G-MET TECHNOLOGIES
Добавлен 27 фев 2017
G-MET Technologies is a consulting firm specialized in numerical simulations applied to computational fluid dynamics (CFD), structural mechanics, and heat transfers.
Also, We have now developed a solver that we used in our latest videos. It is called marineFoam. It is a solver entirely developed at G-MET Technologies, by our very qualified engineers. If you want to know more about our engineering techniques, our work, our case studies, or our company, please contact us through one of the links below.
Furthermore, our areas of expertise are Marine, Nuclear, and Industry.
Also, We have now developed a solver that we used in our latest videos. It is called marineFoam. It is a solver entirely developed at G-MET Technologies, by our very qualified engineers. If you want to know more about our engineering techniques, our work, our case studies, or our company, please contact us through one of the links below.
Furthermore, our areas of expertise are Marine, Nuclear, and Industry.
OpenFOAM - CFD - Generic Prismatic Planing Hull in Head Waves
At G-MET technologies we help naval architects to design efficient ships. For instance, this video illustrates a simulation of a generic prismatic planing hull (GPPH) in head waves at Fr 2.6.
This is the same case as before but with waves!
Stokes V waves are generated thanks to the waves2foam package of Niels Gjøl Jacobsen.
The simulation is performed with marineFoam. We use many special features for enhanced marine simulations such as implicit VoF formulation, Ghost Fluid Method, improved motion libraries, damping zone, etc...
This is the same case as before but with waves!
Stokes V waves are generated thanks to the waves2foam package of Niels Gjøl Jacobsen.
The simulation is performed with marineFoam. We use many special features for enhanced marine simulations such as implicit VoF formulation, Ghost Fluid Method, improved motion libraries, damping zone, etc...
Просмотров: 3 310
Видео
OpenFOAM - CFD - Generic Prismatic Planing Hull
Просмотров 4 тыс.3 года назад
This video illustrates a simulation of a generic prismatic planing hull (GPPH) in a calm sea state at Fr 2.6. This ship is part of a special workshop (www.navalengineers.org/Portals/16/Events/MACC18/NSWCCD-80-TR-2017-015.pdf?ver=2018-01-16-152612-330) held in 2018 for the Multi-Agency Craft Conference. The simulation is performed with marineFoam. We use many special features for enhanced marine...
OpenFOAM - CFD - Waves Propagation On An Offshore Platform
Просмотров 2,8 тыс.3 года назад
Waves propagation simulation can be very useful for calculating hydrodynamic loads on offshore structures. Pressure fields can be used by a mechanical engineer for structure sizing and dimensioning. This example illustrates a demonstration case of waves interacting with an offshore structure (jacket). The waves are generated with the standard OpenFOAM library (stokes 5th order). The simulation ...
OpenFOAM - CFD - Container Ship's Resistance in Waves
Просмотров 1,9 тыс.3 года назад
For naval architects, obtaining data of a ship's resistance in waves can be crucial, like for instance with the choice of engine/propulsion system, fuel consumption, etc... Below is an example of a simulation for a container ship (KCS) (Tokyo 2015 workshop). The waves2foam library (Niels Gjøl Jacobsen) makes it possible to generate reliable waves. Also, the free surface is calculated with the m...
OpenFOAM - CFD - Propeller Open-Water - KP 505
Просмотров 7 тыс.3 года назад
Simulation of propeller open-water test using CFD approach and OpenFOAM. The propeller geometry is the KP505 (www.simman2008.dk/KCS/kcs_geometry.htm). The calculation is carried out using incompressible transient solver pimpleFoam with sliding mesh technique. The mesh is built using snappyHexMesh and composed of almost 20 M cells. Find us: Website: www.g-met.fr Linkedin: www.linkedin.com/compan...
OpenFOAM - CFD - Centrifugal Pump - Sliding Mesh - DES
Просмотров 9 тыс.3 года назад
This simulation is an example of rotating machinery using OpenFOAM. The centrifugal pump is simulated with pimpleFoam solver and SST DES turbulence model. Find us: www.g-met.fr Linkedin: www.linkedin.com/company/g-met-technologies Don't forget to leave a thumbs up, and, comment this video if you have any questions Relevant Hashtags: #Opensource #industryprocess #Openfoam #simulation
OpenFOAM - Planing Hull in Irregular Sea State
Просмотров 7 тыс.3 года назад
This video illustrates a simulation of a planing hull in an irregular sea state. The simulation is performed with marineFoam. We use many special features for enhanced marine simulations such as implicit VoF formulation, Ghost Fluid Method, improved motion libraries. If you want to know more about our engineering techniques, our work, our case studies, or our company, please contact us through ...
OpenFOAM - CFD - Nuclear Storage Pool during an Earthquake
Просмотров 3793 года назад
This video illustrates an example of a sloshing kind of simulation in the case of a nuclear fuel storage pool subjected to an earthquake. The accelerogram used in this simulation is fixed and the results obtained are therefore purely illustrative. The underlying objective is to calculate the forces on the concrete walls in order to verify the civil engineering dimensioning. The simulation is ca...
OpenFOAM - CFD - Self-Propulsion in Head Waves with Rotating Propeller (3DOF)
Просмотров 1,9 тыс.4 года назад
This case shows the simulation of a model scale ship (KCS) in head waves with the rotating propeller. The 3DOF solver uses both AMI and deforming mesh with hierarchy handling. The solver uses the mCICSAM scheme for interface calculation. The stability of the 6 DOF solver is improved using Adams' Bashforth Moulton scheme and Atkins dynamic relaxation. The waves are generated using relaxation zon...
OpenFOAM - CFD - KCS Ship in Head Waves (3 DOF)
Просмотров 1,1 тыс.4 года назад
This case shows the simulation of a model scale ship (KCS) in head waves at Fr = 0.261 using a special solver for marine application developed at G-MET Technologies. The case is C5 from Tokyo 2015 CFD workshop. The solver uses the mCICSAM scheme for interface calculation. The stability of the 6 DOF solver is improved using Adams' Bashforth Moulton scheme and Atkins dynamic relaxation. The waves...
OpenFOAM - CFD - Full Scale DTMB 5415 Ship in Head Waves with Trim and Sinkage
Просмотров 1,7 тыс.4 года назад
This case shows the simulation of a full-scale US Navy Combatant (DTMB 5415) in violent head waves using a special solver for marine application developed at G-MET Technologies. The solver uses the CICSAM scheme (Ubbink) for interface calculation. The stability of 6 DOF solver is improved using Adams' Bashforth Moulton scheme and Atkins dynamic relaxation. The waves are generated using relaxati...
OpenFOAM - CFD - Full Scale US Navy Combatant Ship - Resistance Calculation - (DTMB 5415)
Просмотров 1 тыс.4 года назад
This case shows the wave pattern of a full-scale US Navy Combatant (DTMB 5415) using a special solver for marine application developed at G-MET Technologies. The solver uses the modified CICSAM scheme (Wacławczyk) for interface calculation with a deferred correction approach. The stability of the 6DOF solver is improved using Adams' Bashforth Moulton scheme and Atkins dynamic relaxation. The so...
OpenFOAM- CFD - Full Scale Kriso Container Ship - Resistance Calculation
Просмотров 3,5 тыс.4 года назад
This case shows the wave pattern of a full-scale container ship (KCS) using a special solver for marine application developed at G-MET Technologies. The solver uses the modified CICSAM scheme (Wacławczyk) for interface calculation with a deferred correction approach. The stability of the 6DOF solver is improved using Adams' Bashforth Moulton scheme and Atkins dynamic relaxation. Waves reflectio...
OpenFOAM - CFD - Cavitation Prediction in Journal Bearings
Просмотров 1,5 тыс.5 лет назад
Example case showing the cavitation capabilities of OpenFOAM. The video shows the pressure and void fraction distribution of the journal. The rotation speed is 2500 rpm. The fluid properties are those of a lubricant (psat = 3000 Pa). Initially, the pressure is uniform (1 atm) and due to the rotational speed of the journal cavitation occurs. Also, We have now developed a solver that we used in o...
OpenFOAM - CFD - Sport Car - Aerodynamic Flow - DDES-SA
Просмотров 3,6 тыс.5 лет назад
Example case showing the numerical simulation of the airflow near a car. The OpenFOAM solver used is pimpleFoam with DDES - SA turbulence model. Also, We have now developed a solver that we used in our latest videos. It is called marineFoam. It is a solver entirely developed at G-MET Technologies, by our very qualified engineers. If you want to know more about our engineering techniques, our wo...
OpenFOAM - CFD - Wind Turbine with Sliding Mesh (ACMI) - DDES-SA
Просмотров 5 тыс.5 лет назад
OpenFOAM - CFD - Wind Turbine with Sliding Mesh (ACMI) - DDES-SA
OpenFOAM - CFD - Vortex Induced Vibrations (VIV) in Tubes Bundle
Просмотров 4,7 тыс.6 лет назад
OpenFOAM - CFD - Vortex Induced Vibrations (VIV) in Tubes Bundle
OpenFOAM - CFD - 2D Vortex Shedding with Oscillating Cylinder
Просмотров 2,2 тыс.6 лет назад
OpenFOAM - CFD - 2D Vortex Shedding with Oscillating Cylinder
OpenFOAM - CFD - Boat in Waves with waveDyMFoam
Просмотров 6 тыс.6 лет назад
OpenFOAM - CFD - Boat in Waves with waveDyMFoam
OpenFOAM - CFD - Mixing Application with AMI and Free Surface
Просмотров 2,9 тыс.6 лет назад
OpenFOAM - CFD - Mixing Application with AMI and Free Surface
OpenFOAM - CFD - Mixing Tank with AMI and Free Surface
Просмотров 2,9 тыс.6 лет назад
OpenFOAM - CFD - Mixing Tank with AMI and Free Surface
OpenFOAM - CFD - Oil Water Separator - Multiphase Simulation
Просмотров 8 тыс.6 лет назад
OpenFOAM - CFD - Oil Water Separator - Multiphase Simulation
OpenFOAM - CFD - Propeller KP505 Using AMI - LES Simulation
Просмотров 2 тыс.6 лет назад
OpenFOAM - CFD - Propeller KP505 Using AMI - LES Simulation
OpenFOAM - CFD - 2D Rayleigh-Benard Convection
Просмотров 2,3 тыс.6 лет назад
OpenFOAM - CFD - 2D Rayleigh-Benard Convection
58631 Sofia Causeway
Mesh size?
very nice simulation and post processing!
This looks amazing! Could you share the code? It would be cool yo have it for illustrative purposes
Can u share how to make it,
What software do you use to represent results ?
Dear Sir, Could you please explain how did you post process? I can not make this type of result using Paraview.
Thats cool 🙂
Hello! Do you take CFD commissions like these? Thanks!
is this marineFoam solver avaliable on any library? or is it proprietary?
how to make this simulation at open Foam.....thanks
hi, could you please specify which divergence scheme you used to discretize phi,alpha? looks to be critical to mitigate numerical ventilation
can you share the case files please?
Could you please share the files for that simulation and what would be the cost?
the person who performed this simulation is a wizard
Do you have any tutorial for this simulation?
Blessed by algorythm
Very nice work! Could you please tell me which software you used for the post process? Thank you.
It's very likely it is Paraview
Very cool! What is the sliding mesh technology used? Do you have references?
is there some tutorial or some file we can download to replicate this work? it looks extremely well done!
That's an amazing sim! Is it possible to provide the openFoam case files to recreate this?
Hi the simulation result looks very nice. I have one question: Could you lower the y plus down to <5 when using SHM?
This video was very helpful for me. I'm working on rotorblade analysis with AMI dynamic mesh in OpenFOAM v2012. However, my case(30M meshes, 140cores) was enormously slow(for 1 iteration, 10s for mesh update, 12s for rhoPimple algorithm), and expected to take almost 100days for 5rev calculation which seems unrealistic. Are there any tips to reduce the calculation time?
Usually fixed platforms are made of tubular frames, and dominated by drag and inertia forces, so Morisson's equation is quite accurate. Is there any added value of CFD? What is the gmesh size, time step size ? Is this a turbulent solver or laminar?
Nice work! Have any References for the implementation of the Ghost fluid method?
How was the Q-criterion selected? And is this solved using AMI? Thanks!
Hi, thanks for you comment. It is using AMI connections
That’s beautiful! Roughly how many core hours did it take to run it all?
Hi, thanks you very much for your comment. We used 64 cores. Simulation ends in less than 1 day.
How do you select the Q-criterion value for this example? :) And what LES model was used?
Great work as always!
Thank you very much!!
What's the dynamics mesh technology called?
deforming grid
@@g-mettechnologies881 This algorithm seems quite good, no negative volume cell detected.
@@飞猪-r6s Indeed it is
Really cool video
Thank you we really appreciate it because we really work hard to create this!
NICE!!!
Thank you so much
Great video!
Thank you!!
Cool! Are you gonna make other videos in the nuclear??
Maybe... We hope so!
Very Nice!
Thank you!
Really good
Thank you so much!
Great video! Design is amazing
Thank you! We appreciate it!
Nice!!
Thank you!
What are the details of the simulation - mesh count, time step size, Froude number, physics models, simulation time, etc.
Hello, Mesh size : 3 M. Time step : 0.0025 s. Average Co number : 0.1. Maximal Co number : 4. Froude number : 1.7. Physics : VoF/GFM - SST. Simulation time 40 sec. Thanks for your comment
@@g-mettechnologies881 Thank you. Is this for one side or do you simulate both sides? Also, I am curious to know what machines you run this on and how long it takes to simulate it?
Nice! Could you comment about the state at 0/? You seem to start from a 0 velocity field. Do you constrain maxCo or fix a timestep e.g. 1deg/timestep? Any problems with velocities reaching unrealistic velocities (several time the blade tip velocity). Thank you.
Hello lookid. Indeed, at t = 0 sec, the simulation starts from a 0 velocity field. We could have used a steady state solution from MRF instead. We work with maxCo number of 2. The average Co number is below 0.2. We didn't face any problem so far regarding unrealistic velocities. If you have this kind of problems, the origine may come from mesh or numerical settings. It's hard to say without more information...
@@g-mettechnologies881 Thanks for the info :) My main problem is solved, I let the MRFZones dictionary in constant/ from the simpleFoam run ^^', so I had rotating mesh + source of rotation. I was not asking you for troobleshooting my case don't worry, simply interested. Do you also use second order schemes from t=0?
A complete tutorials might help us understand better..nice teasers
Hi, Thank you for your comment. We are not planning on doing a full tutorial video, but we give OpenFOAM training if you want to dive deeper into simulation and CFD. You can find it on our website here: www.g-met.fr/openfoam/ Or contact us at contact@g-met.fr
Could you do a full tutorials please?
Hi, thanks for your comment. If you want we are proposing OpenFOAM training on our website at www.g-met.fr/openfoam/ or contact us at contact@g-met.fr
Good one! Congrats, it's really amazing! Have you used sixDoFRigidBodyDisplacement for each cylinder in pointDisplacement file? How much reliable do you think this simulation are? I'm trying to simulate with 2 cylinders (tandem arrangement) free to oscillate in both in-line and transverse directions (2dof).
Dear Paulo, Thank you for your comment. This case takes advantage of rigidBodyDynamic library. You can define multiple moving bodies. On the reliability, it's hard to tell without proper benchmarks. But you will have the same problem with commercial tools.
It looks great. Did you define all "cylinders" as one patch or separate patches?
Separate patches! Regards
Fantastic
Thank you!
Which solver do you use for simulation? Can you share the case files? Thanks.
The solver is cavitatingFoam. Regards
@@g-mettechnologies881 can you please share the case file?
Please, share for this tutorial faizamine20@@t
Please, share for this tutorial faizamine20@@t
can you give me your gmail ??
Openfoam для истинных гидродинамиков (для царей вычислительной гидродинамики). Отличные материалы, парни. Может тоже решусь свои работы по пожарам здесь выложить.