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@VLS-x3g 8 күн бұрын
Your equations and their description is not correct. You mix up incompressible and compressible parts. The compressible equations are not mass, momentum and equation of state but mass, momentum, enthalphy / energy and equation of state.
@pranayp10 23 күн бұрын
Superb presentation I've ever seen!
@HaoTAN-l6e Ай бұрын
Your tutorial is very useful! Thank you very much! Have you compared the calculated results with the experimental datas? Can you provide the literature related to this experiment?
@CFD_Mojtaba 19 күн бұрын
Thank you very much for your interest in my contents. Please have a look at this paper? doi.org/10.1007/s40430-022-04012-w
@HaoTAN-l6e 19 күн бұрын
@@CFD_Mojtaba thanks a lot
@dienhuynhmanh9950 Ай бұрын
Hi, guys! This is a great video. However, I wasn't able to calculate the FTL and boundary layer thickness the same you did. Could you please provide the value of the dynamic viscosity (v)? Thank you!
@wajidullah8952 Ай бұрын
very informative video sir how can I contact you? sir can I get your email I have a problem with my simulation
@yaserdmohamadi3690 Ай бұрын
Hello. thanks for your informative video. could you please share the presentation ?
@CFD_Mojtaba 19 күн бұрын
Thank you very much for your interest. Please send an email to this address: [email protected]
@邱柏森-o9t 2 ай бұрын
I am doing CFD research regarding the wind turbine. And thanks for your explanation. Well done!
@АлексейКолесников-г4э 2 ай бұрын
Hello. Excuse me, could you help me? I'm modeling a tidal turbine, I need to find the average thrust and average power. But I didn't understand how you set up the power report. You multiplied the RPM by some figure, and then multiplied it by the torque report. What were those second digits? Is this transformation rpm into rps?
@EAR.Pakistan 3 ай бұрын
Total pressure=Static+Dynamic. In CFD by Ansys does not match. Why?
@hewenhu 3 ай бұрын
could you send me the .sim file without mesh ?
@hewenhu 3 ай бұрын
is it possible to share the simulation file with all settings done, but without mesh
@AnmolSingh-ib5dc 3 ай бұрын
Which software it is???
@vanduyenvimaru6835 3 ай бұрын
Thank you for your nice work. Can you tell me how to make Q-Criterion in a region (not whole calculation domain)? Thanks!
@powerfromoceanLTD 4 ай бұрын
Strange that the buoy not tilting against waves. (pitch) So this is not reality, how to trust?
@mahoneytechnologies657 4 ай бұрын
Very Good and Clear Presentation! I wish every teacher could explain this well, I had a Calculus Professor who did this well which combined with a Small class size was perfect for me. Thanks for the time and effort that you put into this work. You could do a Book and a Set of DVDs. Or an online Interactive book/series!
@mahoneytechnologies657 4 ай бұрын
Can you do a Presentation like this on Landau Damping?
@CFD_Mojtaba 4 ай бұрын
Thank you very much for this comment; unfortunately, I have been extremely busy lately working on several projects. Maybe later.
@mahoneytechnologies657 4 ай бұрын
Great Presentation, Very Well Done - This is really a University Level Class At Home, Thank You! This done better and More Clearly than at most Universities I Bet!
@lex-h7c 4 ай бұрын
can someone suggest how to do a free decay test for heave in this simulation
@CFD_Mojtaba 4 ай бұрын
Hello Dear, Thank you for your comment. You just need to apply some initial displacement in the heave direction without considering any waves. In this video you can learn hoe to simulate the calm water case: kzbin.info/www/bejne/eIu0aamFr511qrc
@lex-h7c 4 ай бұрын
@@CFD_Mojtaba Thank u sir
@abdazisazrin5784 5 ай бұрын
ive tried this 4 times. but it always have reversed flow. but it just between +- 500 surfaces. I think we need to do more refinement isn it.
@hanfiball4136 5 ай бұрын
Using Regions > VirtualWindtunnel > Boundaries and then edditing the boundaries doesnt give me the ability to adjust meshing paramters, i only get "Physics conditions and values". Do you have any ide what my mistace could be? I have obviously created a Mesh continoum already
@CFD_Mojtaba 5 ай бұрын
Thank you for your comment! Note that the Region-based meshing is not available in the new versions of STAR-CCM+. You need to generate mesh using Part-based meshing. Please have a look at this video: kzbin.info/www/bejne/oZKmoHWtbd6hnq8
@kedielanora 6 ай бұрын
Dear Mujteba could you please upload the 1080p version of this tutorial? Regards from ITU
@CFD_Mojtaba 5 ай бұрын
Thank you very much for your comment; unfortunately, this is the only version that I have.
@ShayanRabizade 6 ай бұрын
Dorood Mr. Amiri, This was a great tutorial. I was wondering though about a simple confusion of mine that CFL is measured based on velocity, temporal discritization and spatail discetrization, and usually 0.25 is selected for it. WHY did you select 95?
@CFD_Mojtaba 5 ай бұрын
Dear Shayan, thank you very much for your comment. Note that the condition of having a CFL less than 0.25 is generally more important, when the problem is transient in nature and we are interested in time-varying variables.
@basmahabeeb3485 7 ай бұрын
Hello! Could you please illustrate the value you used in the time step and you says"However, note that the estimation of the time - step size should also be in such a manner that in each time - step, the overset mesh moves a distance smaller than the size of the smallest cell in the background mesh. Therefore, considering this point, the time step size that we are going to use here is 0.001 sec. " from where we can see 0.001 sec in the simulation? please.
@CFD_Mojtaba 4 ай бұрын
Hello, To calculate the time-step size, you can use the Courant number defined according to the minimum cell size within the background mesh, along with the maximum vertical displacement speed of the overset mesh. I hope this helps. Respectfully, Mojtab Maali Amiri.
@basmahabeeb3485 3 ай бұрын
@@CFD_Mojtaba Hello! I still have a problem in the wave generation shape, I tried more than one example but still not normal shape, could you please let me know after calculating the courant number how we can use it in the simulation? I looked at papers says ::"with a second-order temporal discretization scheme. This results in a Courant number (C=Cg. Δt/ Δx, where Cg is the wave group velocity) less than 0.5; hence, the High-Resolution Interface Capturing (HRIC) scheme that is suited for tracking sharp interfaces is guaranteed to be used during the simulations. My question is after calculating the courant number (C=Cg. Δt/ Δx, how to use the result value in the simulation? Do you have an example, please?
@James-sh4zf 7 ай бұрын
Is this 2D, so the subscripts i and j representing velocity in x and y directions?
@rahatullah4232 7 ай бұрын
Fascinating, glad you're born
@hanfiball4136 7 ай бұрын
This was a very useful video for people who are just getting started and need to learn how to use the programm. What I would have liked to see where more informations ony why we use the values that are shown and what they mean
@nikkocarmelitosatuita2295 7 ай бұрын
my star ccm have missing node under tools>update event how can i fix it?
@nikkocarmelitosatuita2295 7 ай бұрын
can you help me in my problem?
@nikkocarmelitosatuita2295 7 ай бұрын
my vertual tank rotates when i started to run it
@rachidtayeb1465 7 ай бұрын
Thank you for this interesting tutorial. Can you give me how calculate the wetted length and wetted area.
@MohammedKhantheacademician 7 ай бұрын
Why did you not specify the velocity of current and wind in the VOF? Is the Buoy stationary? I have a boat moving at certain speed, where should I specify its velocity?
@张梦正 8 ай бұрын
Good job, I would like to ask how to solve the following problems when I simulation:Error while executing calls to SIMULIA CSS, Abagus error in SMAcseNotifyStart. Director terminated the analysis due to early termination by a client. Please check for errors foreach of the analysis involved in co-simulation and also verify that the co-simulation duration timespecified in the configuration file is correct
@reinhardt0731 8 ай бұрын
wow thank you so much. You helped me a lot
@TheHumanNexus 8 ай бұрын
Thank u for such a detailed tutorial…
@johnphilip3379 8 ай бұрын
Can you please help me with my matlab code for SMAC. Can you share your contact email
@johnphilip3379 8 ай бұрын
Please respond
@mmnyako 8 ай бұрын
Thank you for sharing! quick question pls, Can we employ symmetry plane boundary conditions at the XZ plane and YZ plane of the buoy? I am guessing it will reduce some computational demand, BTW I am using ANSYS fluent
@tuyenquangle474 9 ай бұрын
appreciate your kind share ! could you make tutorial of floating wind turbine with mooring line in Star-ccm+ please ?
@lorenzovonmatterhorn3007 9 ай бұрын
Hi your simulations are very impressive. I need a suggestion on my simulations. I should make a DFBI simulation (with Star CCM+) in which the body turn around it self (arround y axis, obviously arround its center of mass) with a time dependent angual velocity. The problema is that with a DFBI simulation I can impose just the initial velocity of the body. Do you have an idea about how I can impose a time dependent angular velocity of the body?
@CFD_Mojtaba 9 ай бұрын
Thank you for your interest in this video, You may need to impose this rotational motion using the rigid body option.
@lorenzovonmatterhorn3007 9 ай бұрын
@@CFD_Mojtaba Can we chat (in some way) about this problem? Because it is not so easy.
@MohammedKhantheacademician 9 ай бұрын
Can you make a video on ship hull on the mean surface.
@Alexis-br4oh 9 ай бұрын
Such a great summary !
@VikashKumaroe22m021 9 ай бұрын
Thank you for this tutorial, sir can you make the tutorial on air supported floating platform to find its heave response
@CFD_Mojtaba 9 ай бұрын
Thank you for your suggestion. I will try to do this. Note that you probably need to consider that the fluid flow is compressible.
@VikashKumaroe22m021 9 ай бұрын
Sir, actually i model the background like you model it for buoy motion tutorials and for air-supported it is a box structure open at bottom but in starm ccm, I was unable to model the opening at the bottom, so I thought of assigning some boundary conditions to the bottom and sir i have a question how can i model air inside the box and tell me how i should model so that backgorund water should go inside it to compress air.what boudary condition i should assign for open part initially it is wall.@@CFD_Mojtaba
@CFD_Mojtaba 9 ай бұрын
@@VikashKumaroe22m021maybe you dont need to model explicitly the air behvior. You can express this effect as an external force.
@VikashKumaroe22m021 9 ай бұрын
@@CFD_Mojtaba ok thank you sir and which boundary condition i should assign for bottom surface of box so that background water can go inside it,
@muhammadsaadkhan9701 9 ай бұрын
Thanks for the lecture. Kindly add references of the information.
@CFD_Mojtaba 9 ай бұрын
Thank you for your comment. The references are added to the video description.
@idreeskhan-zp5ey 9 ай бұрын
Thank you for the effort. Can these models be coupled with LBM CFD method?
@CFD_Mojtaba 9 ай бұрын
Thank you for this comment, I believe that they can be coupled.
@SuperArundhathi 9 ай бұрын
Hi, I am finding the added mass and damping coefficient of different floating structures using the forced heave method. For that I simulated a cylinder in free surface by STARCCM+. I should get a force between -5 and 5N when STARCCM+ gives me a force of 30N. I deduced buoyancy force and hydrostatic force from it still not in the desirable limit. following are the details and solvers i used for the simulation 1) implicit unsteady, VOF for free surface , K - epsilon turbulence with no DFBI and dynamic mesh . I also tried dynamic mesh (overset) and DFBI . 2) I have given velocity in the form of A SIN (wt) form under the motion tool as translation motion. 3) My CFL number is kept below 3 4) Flat wave with zero velocity for air and water. Initial conditions for velocity and pressure are given as zero. 5) slip wall for domain walls , and no slip wall for the translating body. The drive contains my simulation . Can u please take a look at my simulation and tell me wats wrong? drive.google.com/file/d/1rFnL4449stu4aWyPewxF3HGHoxp11_j3/view?usp=sharing
@user-wn1jf7pg6x 10 ай бұрын
merc mamnoon
@dirkneethling 10 ай бұрын
@2:03 - What is k on the E(k) graph? The "wer" number?? It was inaudible
@CFD_Mojtaba 10 ай бұрын
Please, have a look at the following video: kzbin.info/www/bejne/qYbUl5SqiruIhq8
@dirkneethling 10 ай бұрын
@35:09 - How do you obtain the 4th order equation below the vorticity function? It was not clear from the video.
@CFD_Mojtaba 10 ай бұрын
It involves sophisticated mathematical manipulation
@Troubledhead 10 ай бұрын
Hello, how can i dowload this program ?