✅ ANSYS FLUENT - Drag Coefficient Tutorial (REFERENCE VALUES 3D) - Cube

[@Abduldoctor]

You have literally saved my airfoil assignment with the angle of attack you did. I can't thank you enough for that. I have started doing Fluent and CFX tutorials on your website to improve my CFD.

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As a mechanical engineer, your videos helped me a lot, thanks !

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[@flyingmerlin2]

It is a clear and easy to follow tutorial. Also, interesting to see the relatively close results without further mesh refinement on the cube's wake. Thank you and I hope you can continue sharing.

[@nanpround1665]

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Nice Video. Thank you

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[@МаусЦзэдун]

Спасибо за видеоролик

[@rBailey2020]

Great video

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[@sjkep445]

excelente video. sigue así!

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[@13Gibson87]

Nice video ;) keep going

[@hananehome2108]

Hi CFD Ninja, Thanks for your dedicated tutorials first of all. I was wondering though if you have tried overset mesh in 3D inside the Fluent?

[@ArkhipovIlya]

Nice task

[@YuriTheodoro]

Tanks for all

[@ivanvanko1763]

Thank you so much for your amazing videos!

[@childhoodforever223]

Sir, if I am analyzing flow through a cluster of buildings (3D) such that central building is of height 0.3 m and it is surrounded by 8 smaller cubical buildings of 0.1 m height (basically it is an array of 3 by 3 with taller building at center), now in this case if one were to observe this configuration from inlet, the total projected area would appear to be that of taller building + 2 surrounding shorter buildings. However, if my goal is to calculate drag and lift of only taller central building, then what should I enter in area?

[@elyselapalme7040]

can you make a tutorial on how you made your mesh? I try to do the same with a sphere

[@ken-6166]

Thank you for your help

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CFD NINJA hleped me during my BEng dissertation in 2016. I watched the videos on repeat till I figured it out. So a huge thank you from me. And other like me Also it would be nice to win the gift card.

[@thanchauvan8092]

Thanks for your tutorial. I have a question. Why did you choose velocity is 2.8 m/s

[@shuvadipdey7089]

In my case coefficient of drag is plotted as 0 for all iterations...I cannot understand the mistake I am doing ...kindly help The plot seems correct though

[@ianm1898]

hi can you explain why you choose Splarat Almaras rather than any other turbulent mode, thank you so much

[@ansys_cfd]

Hi friend, Spalart Allmaras considers the detachment of the boundary layer. Regards

[@nickleonardthomas]

Commenting!

[@natalajarzab2120]

If I am simulating for example an aircraft, then what should I write in Reference Values - area and length? Are those dimensions of enclosure?

[@borubaybatr7850]

Hello , İ am a beginner and have some questions to you master, when we create the geometry do we extract the cube from the geometry ,and also if we extract what is the cube in this video is it the surface inside of the wind tunnel?

[@ansys_cfd]

Hi friend; In this case there is only the control volume without the cube (neither are the faces of the cube). Regards

[@ksa2199]

Hey man I am getting this error every time I try to open your cube.cgns file how do I fix this ? I am using the student version of Ansys CFD workbench R1 . Error: No journal response to dialog box message:' This is a student license, and can only be used with cases containing less than 512000 cells. Please exit this fluent session and start another session to continue' . Internally, cancelled the dialog. Error: inquire-face-threads: invalid grid Error Object: #f Error at host: This is a student license, and can only be used with cases containing less than 512000 cells. Please exit this fluent session and start another session to continue

[@ansys_cfd]

Hi friend, you need the commercial or research license. Regards

[@turbochargersutututu]

Question. You made a named selection for the cube right? How did you do it? Did you select each surface of the cube manually? because It's subtracted from the domain.

[@stoicism-101]

Hello! How can I plot drag coefficient as a function of volume fraction instead of iterations?

[@mukutvlog]

In order to create this geometry in ansys spaceclaim, after cutting the cube from the flow domain, shall I keep this block or remove ? Thanks

[@shindiregitasyali9248]

If I want to analyze drag due to surface roughness that requires near-wall treatment, can I use Spalart-Allmaras instead of k-w SST? I'm trying to validate a flat plate wind tunnel experiment. Thank you!

[@md.talhahossainkhan2643]

Hello CFD Ninja what geometry is specified as fluid in cell zone above boundary conditions Thank you in advance

[@SaiPrajithG]

hi sir big fan of your work can make a tutorial on how you made the cube and boundary

[@hrithikks9318]

If I change the velocity value from 2.6 to 20m/s I am getting Cd value of 60...I have used your geometry itself..can you please explain on how to overcome this problem..thanks

[@TheMr555]

sir, can you please explain the difference between .msh file & .cgns file?

[@blobpo692]

Hi sir, what if the geometry is not symmetrical? For example the top of the cube is longer than the bottom, do we take average length?

[@ansys_cfd]

Hi friend, It is necessary to do a laboratory test to obtain the drag forces then calibrate the numerical model

[@sirusfalcony]

Which book do you suggest to understand the fundamentals/theory of CFD?

[@ansys_cfd]

An introduction to computational fluid dynamics by Verteeg & Malalasekera

[@leonardolucetti6255]

Hi, I have a problem. While defining the reference values, I don't have the "fluid" option in "reference zone", but the only option is "solid". I'm trying to calculate the drag coefficent of a sphere that I designed using design modeler. Thank you for your help to whoever replies!

[@azooz05030]

Hi I want calculate drag force Is it the same way?

[@ansys_cfd]

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[@adityakishore3171]

what device are you using(processors, graphics etc)? fluent keeps crashing on my device when i try to import the mesh. any suggestions?

[@alviahmmed326]

Hey CFD ninja..thanks very much for uploading :) .I have a question. In meshing, do I have to substract the cube from fluid? And how can I name it if substracted? My result is around 1.20 :(

[@ansys_cfd]

Hi friend, you need remove the cube (substract body). Regards

[@ansys_cfd]

Hi friend, you need remove the cube (substract body). Regards

[@fauzanakbar1260]

One question why do you choose Spallart alllamus model for viscous?

[@ansys_cfd]

It is due to the separation of the boundary layer

[@ansys_cfd]

It is due to the separation of the boundary layer

[@VishalGupta1996]

Hi, which CFD software package would you recommend for a beginner?

[@ansys_cfd]

ANSYS CFX, here several tutorial: cfd.ninja/tutorials/cfx-tutorials/ Regards

[@EngrHMHassan]

how we can get lift and drag coefficients in ANSYS CFD-post???

[@Abduldoctor]

You do it in solution not in results.

[@EngrHMHassan]

@@Abduldoctor How in CFX?

[@iIiWARHEADiIi]

Hi. Is your cfd.ninja website still alive? I have message that it is like in update and please wait. Thanks for any info.

[@ansys_cfd]

Hi friend, We are updating the web to expand our server, in a few days we will launch it. regards

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@@ansys_cfd thanks

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[@ozgurkeskin4664]

what if we are using a complex geometry such as an uav? what should we do in reference values, thank you. btw im interested in with gift card

[@ansys_cfd]

Hi friend, good question, you need project the geometry to plane, maybe using Inventor or Solidworks you can obtain the areas. Regards

[@ssean4005]

@@ansys_cfdIf I change the inlet velocity direction to get a certain angle of attack, should I just project the modal to the plane that perpendiculars to the velocity direction?(the cross-section is square)

[@mohamedhassantahir2193]

Bro where is the cube file nothing is there on the link

[@ansys_cfd]

Hi friend; Here is the link: cfd.ninja/ansys-fluent/ansys-fluent-drag-coefficient-reference-values-cube-3d/ It is on the video. Regards

[@michael.adel.shafik]

if a cylinder with diameter 0.5 and depth 2.5

[@michael.adel.shafik]

is area 1.25 and length 0.5 ?

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