ANSYS Fluent Tutorial | Heat Transfer Analysis | Surface Nusselt Number | Skin Friction Coefficient

[@mugajoph]

Thank you for the clear explanation and illustration. May God bless you

[@AnsysTutor]

Thanks.

[@shyammenon5298]

Your video is very useful and systematically explained. To check convergence, also add one or more monitor points using report definition option. If you make habit of using one or more monitor points then it will be proper way of verifying convergence

[@AnsysTutor]

report definition will only show the desired output result. It might not control the convergence, I am right.?

[@shyammenon5298]

@@AnsysTutor Sometimes residual goes below the prescribed convergence criteria that doesn't mean that solution is converged. To verify convergence we must create one or more monitor points using report definition option. When the property such as avg. pressure or temp assigned to the monitor points reaches steady constant value then only we can surely say that solution is converged. Sometimes monitor points also Don't reach steady valur in such case we can conclude that solution can never reach steady state and such problem should be solved by transient model. Example vortex shedding behind cylinder.

[@aniketarundhavale6565]

Hello Sir, very useful video. Can you perform heat transfer analysis of water flowing through a pipe, in which the pipe is fitted with strainer.

[@amolkarad8176]

Hello Sir i watched each and every video of ANSYS Tutor. For project purpose i need DPM Method.Could you please make one video of how to make nanoparticles and water injection separately in 3D domain and how to track that or analyse the behaviour of mixing. Thank you in advance🤝

[@AnsysTutor]

Will try to make a tutorial.

[@Subi_Profe]

Hi, I can not select "Data file quantities" in file menu, so I can not take Nusselt Number.... am I doing something wrong? I have student version...

[@AnsysTutor]

You have to initialize first, then only you can see the data file quantities.

[@shuvajitmandal8030]

Thank you so much ❤️

[@AnsysTutor]

You are most welcome.

[@HarmanSingh-ev1xy]

Great 👍

[@kisitudeogratius301]

Good job!

[@AnsysTutor]

Thank you.

[@raoheo9391]

Thanks for perfect lecture! Would you recommand lecture of your video about making bubbles in water?

[@AnsysTutor]

Will try to make a tutorial on this.

[@raoheo9391]

Ansys-Tutor Thank you!!

[@ilhemzeghbid4112]

Can you send me a sample video to orient me?

[@antoine1407]

Thank you, should’ve created the mesh interfaces between liquid and solid?

[@AnsysTutor]

Ansys automatically creates shadow interfaces between solids and liquid after you assign two different cell zones conditions.

[@navarajadhikari728]

Hey ansys tutor, I am trying to do heat trasnfer in double pass collector where flat plate absorber place in between the flow channel but I am not getting results. Can you help!

[@AnsysTutor]

Mail us with details [e-mail]

[@anujmukherjee2776]

Very useful

[@AnsysTutor]

Thank you.

[@Yashvardhan_54]

what exactly is surface nusselt number and how is this different from regular nusselt number. Because nusselt is convective heat transfer to conductive heat transfer in a fluid medium. Which confuses me as what exactly are we finding by surface nusselt number. Because nusselt number helps define type of flow happening in of fluid domain.

[@AnsysTutor]

Both are same, only in fluent its name has been given as "surface Nusselt number " as its a purely surface phenomena. By the help of Reynolds number you can define the type of flow.

[@Martin-nr2xf]

Ohhh thank you this is very helpful. So many things I didn't know. My heat transfer simulation involves about eight bodies (body in a body in a body…) with many interfaces. Will the same procedure apply? Do i selected coupled under Thermal for all interfaces?

[@AnsysTutor]

Yes. You should select all as coupled wall.

[@Martin-nr2xf]

@@AnsysTutor Alright thank you. I will do just that. Any ideas on how to model a vacuum between to shiny surface walls And how to model heat transfer by radiation through the vacuum?

[@AnsysTutor]

For vacuum zone I think you need to write a UDF. In the model you need to enable the radiation model. & Select "DO radiation model" it's the best model for such type of radiation problem.

[@Martin-nr2xf]

@@AnsysTutor Thank you

[@dhk697]

Thank you so much. But I have a problem. I chose surface Nu number on Data file quantities but can't find at chart. How can I solve the problem?

[@AnsysTutor]

Try to reset the results then open.

[@catalinaestefaniapenaoyarz1596]

Hello! Thanks for the video! I have a question... I'm doing a model of a square mini channel (hydraulic diameter of 0.001 m). The problem is that when I compare the pressure drop of the model with experimental results there is a huge difference (the model pressure drop is too high in comparation of the experiment), and I can't figure why. Basically, I did something similar shown in the video. Do you have any idea of what could have happened? Thank you!!

[@AnsysTutor]

Check the units of the model first. If you had done it correctly then check for any reversed flow warning during iteration process. If there is a reversed flow, you need to correct the meshing or create some developmental length.

[@shuvekshasapkota5574]

@@AnsysTutor it is saying reversed flow in different faces while in fluent. How can i solve the problem ? How can i correct meshing? or solution will be?

[@sudhanshuogalapur.007]

My CFD post processing is not getting opened as it is showing error everytime I do a project , what may be the reason? I just stop at solutions everytime.

[@AnsysTutor]

You should close the setup first before you open the post processing. Also check if you had unchecked the cfd post while installing the software.

[@hindolbanerjee7623]

Sir please vidio on thermal analysis of gas turbine blade.

[@hindolbanerjee7623]

Using cfx

[@hindolbanerjee7623]

As well as steadi state thermal

[@wasiuddin2115]

Why can't I find Surface Nu number in CFD postprocessing? I selected this option as additional parameter before calculation.

[@AnsysTutor]

Check it in fluent results.

[@musetonic7370]

I designed the geometry using spaceclaim and had done share topology. I am not getting a wall shadow in this case. Can you help?

[@AnsysTutor]

Delete the contact surfaces in meshing.

[@sahilpatel5853]

Thank you for the Informative video. Can you please upload videos on 2d nozzle using spray injection (any nozzle type). Also, please try to cover how to plots graphs of velocity and droplet diameter. it would be really helpful to me if you can make it.

[@AnsysTutor]

will try to make a tutorial on this. great suggestion.

[@meteor5277]

@Ansys-Tutor, thank you very much for the tutorial that motivates others to learn. Could you please make a tutorial about thin film evaporation on micro-pillar arrays?

[@AnsysTutor]

Will try to make a tutorial. Thank you.

[@meteor5277]

@@AnsysTutor Welcome and thank you. Did you make any simulation related to thin film evaporation?

[@anijg05]

Thank you for the well explained video :) By naming fluid side wall as 'Pipe wall' in Ansys-Mesh and without specifying anything in Fluent doesn't makes it adiabatic wall? and, if you have two sided wall zones (both are solid) with different material, which one will be shadow wall? because this is important to specify the material for respective wall during boundary condition assignment!

[@AnsysTutor]

yes ,it will became adiabatic wall as in fluent the default wall Boundary condition setting is that. But its always recommended to check all the boundary conditions that were assigned by solver itself, in case of two solid wall & in all case even if in fluid solid wall case you can check the adjacent cell zone to see which one belongs to which cell one. You can find this in the wall Boundary condition option.

[@raoheo9391]

Sir, Even I got perfectly same calculating graph, bu the data graph for the result is displayed with the left and right reversed. How can I fix it?

[@AnsysTutor]

Extract the data to a excel file. &Plot the graph there.

[@ilhemzeghbid4112]

Thank you sir, Is it possible to orient me on the procedure of calculating the entropy due to heat transfer (sh) and the entropy due to friction (sf), by what fluent calculates us as the total entropy ( st). Please help me. Thank you

[@AnsysTutor]

You can use the expression option to get the individual entropy in cfd post results.

[@ilhemzeghbid4112]

Can you send me a sample video to orient me?

[@nihalnani7623]

thank you sooo much

[@AnsysTutor]

Thank you. ❤ ❤ ❤

[@ManojYadav-kt3vn]

Hello sir, a big fan of your tutorials. I am working on solar concentrating collectors. Can you make any tutorial for ray tracing of solar radiation in compound parabolic concentrator.

[@AnsysTutor]

Will try to make a tutorial if possible.

[@dominiclovric8984]

Hi there, Thanks for the tutorial, it was really helpful. However, when I try to select the "Data File Quantities.." under the File tab, it is greyed out and I can't plot the results of let's say Nusselt number in the Results section. Any ideas on how to go around this? Thank you!

[@AnsysTutor]

You should initialize first then go to data file quantities.

[@dominiclovric8984]

@@AnsysTutor Yes, I initialize from all zones but I still don't get the "Data File Quantities" Thank you for your reply!

[@eduardoterriquez4859]

I am having the same issue. I have several projects including a direct replication of this one and it is greyed out. can not find anything about it online. please help.

[@shashankjha6807]

@@AnsysTutor Please help us with this issue.

[@hosseinbalaghienalou5596]

It's in the run calculation tab!

[@Engr-Hassanshehwarshah]

Sir could you tell us Friction factor is also called skin friction coefficient or not.

[@basicmechanicalengineering1322]

thank you for the video, the data file quantities is greyed out on my file. Do you have an idea how to resolve this issue?

[@AnsysTutor]

First initialize then only you can able to see the data file quantities

[@basicmechanicalengineering1322]

@@AnsysTutor thank you for the reply it worked, however the chart didn't show the Nu vs z there was no graph although there is heat transfer. Is there anything that I should do?

[@morais5029]

hello can you explain the processor to the sherwood number?

[@eng.renatocarvalho]

Does someone know where can I find an ANSYS tutorial for the scavenging proccess in a 2 stroke engine?

[@AnsysTutor]

there is a separate ANSYS module for IC Engine problems named as "IC engine(fluent) you need to search tutorials related to that.

[@eng.renatocarvalho]

@@AnsysTutor I tried but just found those tutorials from ANSYS, but these tutorials require archives that you need to have the account to download, and I just have ANSYS for student. Do you have an account to download this files for me?

[@kmn109]

Sir please provide a tutorial on water flow boiling in a rectangular open microchannel.... Please sir

[@AnsysTutor]

Will try to make a tutorial.

[@kadagalaganesh4653]

sir, what it means 'solution is converged'?

[@AnsysTutor]

It means, all the numerical equations residuals fall below the set residual values.

[@shreyaskorde6158]

can you also provide iges file of every video in video description so that we can practice them on our pc

[@AnsysTutor]

we share step by step tutorial on how to create the geometry, so Iges file not required.

[@serdartorun244]

Hi, I want to simulate the cooling channel of liquid propulsion rocket engine, it has simple rectangle channel with inner surface has convective heat transfer from hot gas and at channel there is a flow of coolant

[@serdartorun244]

Can you give me an idea to work on it

[@AnsysTutor]

Can you explain a little bit more about this. I did not get you.is it a double pipe with gas and coolant flow?

[@serdartorun244]

it is like a double pipe but they are rectangle. One is larger, the other is smaller and also at the bottom side of the larger rectangle there is a convection from hot gas side. There is a conduction from larger rectangle to smaller one and there is also a convection from smaller rectangle inner surface to the fluid inside the inner rectangle. By the way, all flows are turbulent. I share link that contains the geometry of the flow. www.google.com/search?q=regenerative+cooling&tbm=isch&ved=2ahUKEwixnr2HzeXqAhUXO-wKHXicBScQ2-cCegQIABAC&oq=regenerative+cooling&gs_lcp=ChJtb2JpbGUtZ3dzLXdpei1pbWcQAzIECCMQJzIECCMQJzIECAAQEzIECAAQEzIECAAQE1CqB1inEGCeE2gAcAB4AIABuwGIAcIHkgEDMC42mAEAoAEBwAEB&sclient=mobile-gws-wiz-img&ei=b60aX_GqMZf2sAf4uJa4Ag&bih=719&biw=393&client=ms-android-xiaomi-rev1&prmd=inv#imgrc=CjRKxRHV3kKOZM

[@zohudmohammed9945]

Dear sir, can you simulate the nanofluid by discret phase model. Thank you so much

[@AnsysTutor]

Ok, will try to make a tutorial on this.

[@mohsenhormozimoghaddam3112]

Thank you so much. In this video Is the nusselt number correct? It's from about 400 to 1000! Is not so much? For example, Based on the Dittus equation, the nusselt number for Reynolds number 10000 and water fluid, it's about 75. But, in this video the flow is laminar and it should be lower than the 75!! Could you please share a video for validation of the nusselt number with the Dittus-boelter equation? Thanks a lot.

[@KILLER76522]

I believe the reason the Nu is so large is due to the way ANSYS Fluent calculates h. The values are artificially inflated because the reference temperature it selects when computing h = q/(T_wall - T_ref) is not the mean fluid temp, T_m, but rather the temperature at the centroid of the cell closest to the wall. This gives a smaller T_wall - T_ref than expected, and thus a larger h. This video does a great job of explaining it: kzbin.info/www/bejne/hqa3nWxumZWckJI

[@jayantachanda1383]

My data file quantities is not getting selected

[@AnsysTutor]

First, do the initialization , after that, you can get the data file quantities option activated.

[@vinjamuriaditya8360]

u r super sir

[@AnsysTutor]

Thank you. ❤

[@azlanirshad8874]

Which ansys version?

[@AnsysTutor]

Ansys academic version 20 R1

[@JDD-u2s]

12:45 Data Files Quantities : Check in Run Calculation

[@akashkumardigal656]

Want to value of nusselt number calculated

[@AnsysTutor]

kzbin.info/www/bejne/qn3Oq5hobJJsfqc

[@lyricme6592]

is there any way to contact you??

[@AnsysTutor]

See all the social media links given in the about tab of this youtube channel page.

[@satwikchivukula8905]

Can we have the streamlines of velocity at a particular plane in 3D. If we can, Please mention the procedure. Please i am in hurry...

[@AnsysTutor]

you need to create a reference plane first, then insert streamline , in that select surface streamline.

[@satwikchivukula8905]

@@AnsysTutor Thank you very much Tried it and done.

[@AnsysTutor]

You are most welcome.

[@atulwithsmile]

Given you want to make a video on htc, you completely missed the reference values, and how do you decide them? Hence, your result wouldn't make sense.!

[@eduardoterriquez4859]

Thanks for the tutorial, it was really helpful. However, when I try to select the "Data File Quantities.." under the File tab, it is greyed out and I can't plot the results of let's say Nusselt number in the Results section. Any ideas on how to go around this? I have initialized the solver and have tried with several projects. It is greyed out and I can not click on it.

[@AnsysTutor]

Generally after initialization, data file quantities appear. Is there any error in meshing?

[@eduardoterriquez4859]

@@AnsysTutor Ansys Academic 2021 R1 does not have this feature. I tried it with a previous version (2020) and it came up just fine. Thanks for the help!

[@sreekanth9441]

@@eduardoterriquez4859 Sir, Iam also facing the same problem. Is "switching the Ansys version" the only option for this problem?

[@eduardoterriquez4859]

@@sreekanth9441 Hello. It worked for me so that's as far as I went with it. In other forums I could not find any more information on it being inaccessible. Good luck!

[@sreekanth9441]

@@eduardoterriquez4859 Ok, thank you for your reply.