ANSYS Fluent Tutorial | How to put a Parabolic Velocity Profile at Inlet without a UDF | 2D Model
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- Опубліковано 8 лют 2025
- In this Tutorial, it has been shown,how you could put a custom parabolic velocity profile at the inlet without using any User Defined Function (UDF) File.
For this demonstration, a 2D pipe geometry has been selected, the Geometry is been created in ANSYS Design Modeler & Meshing in ANSYS Meshing.
The ANSYS Fluent solver has been used for analysis. The tutorial's procedure can only apply to version ANSYS 19 R1 and above.
What will you learn from this Tutorial?
👉 Creating a 2D geometry in ANSYS Design modeller.
👉 Meshing a 2D Geometry in ANSYS Meshing & Creation of a structured mesh in ANSYS .
👉 Solver setup in ANSYS Fluent.
👉 Named Expression in ANSYS Fluent.
👉 How to write a Named Expression for parabolic velocity profile.
👉 Fully developed Flow Profile in ANSYS Fluent at inlet.
👉 Velocity vector & Velocity contour plot in ANSYS Fluent.
👉 Velocity vs Y -length graph in CFD Post Processing.
#ansysfluent #ansystutorial #ansyscfd - Наука та технологія
Perfect tutorial, thanks. That's good they added this functionality to Fluent.
we look forward to the continuation of these beautiful videos thanks
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Thanku so much for this information. You make my life easy
You are welcome. Please subscribe.
Thanks for the great Tutorial!
Ansys tutor is best
Thank you Ramesh.
In the 2D model distance from the axis r is equal to Y, whereas in 3D r will be sqrt(Y**2+Z**2)
It depends on the plane. If its extruded along x-direction it would be sqrt(y**2+z**2)
Just want to ask. How you get the value for vmax?
Your videos are really very helpful. Thank you for your efforts.
I have a question how do we realize that we have to use hybrid initialization or standard initialization ?
It depends on the problem. If you want to put the initial guess or any initial conditions you can use standard initialization. If you don't want to put then you can go for hybrid initialization.
@@AnsysTutor Thank you 😊
What will be the formula of parabolic velocity for rectangular 3D-Duct?
Hey, Great Video. Can u maybe tell me the formula for a 3D Modell with the Flow in X-direction?
Thanks in Advance
In place of x and y change for x and z direction
Thnks v.much for this helpful video. If i need to make the the pipe axis at a distance from x-axis, how can i write the velocity expression, pls.??
Keep the same expression. Only change the geometry, keep the entry of the pipe at a distance from the origin.
Is this possible with a rectangular profil?
Yes.
i got a average velocity i need to have on inlet. can i somehow inpliment it into this formula to get the velocity_max to achieve this average velocity?
Yes, follow the same procedure as shown in this tutorial.
@@AnsysTutor At the Moment we insert a v_max as our starting velocity. But thats not the same as the "average velocity" over the whole inlet. Is there a way to just insert the de desired "Average velocity" rather than inserting v_max and use some iterations on calculating the average velocity appearing.
Sir make video with audio. it add more sense to the begineers
Thanks for the suggestion. We have added voice in our new videos & will continue in that format as it helps many viewers.
@@AnsysTutor Sir i really appreciate your reply on my comment..
Thanks
Most welcome. Plz subscribe 🙏
Ansys 19.0 doesn't have the named expressions section? sad
@ansys Tutor, please what is the difference of selecting "outlet pressure" and "outflow" for the outlet boundary condition. does it means the pressure at the outlet is 0. which selection can be used for the pressure at the outlet have zero pascal value
You can use pressure outlet ,if you are aware about the outlet pressure value.
hi Expert, the below expression for the velocity profile 0.001[m/s]*(1-(x**2+y**2)/(10[mm])**2). was the velocity of the problem given as 0.001 and the Radius of the pipe wall given as 10mm.
Hello. can you tell me a way to put fully developed velocity profile at inlet?
For fully developed flow you need to insert an UDF or use the named expression option. We have a tutorial regarding this please check.
@@AnsysTutor Can you link me to it please, i cant find it
ua-cam.com/video/LF06grv299A/v-deo.html
@@AnsysTutor this is the link to this video only 😳
I tried following your steps, I get an error message ("Empty Value") when I finish entering the velocity profile equation. what could be the problem. should I put a value for the x and y component OR Ansys understand it and solve accordingly
No need to put x &y value, only you need to check the expression , check if you had mentioned all the units and parameters etc. There should not be any space inbetween.
hello sir,
how do I correct the following abnormally on the simulation carried out:
1. there seems to be something strange happening with my velocity near the inlet.
2. I expect the v velocity to be 0 or nearly zero everywhere.
3. The pressure drop should be linear. but I am getting a different value
the axial velocity at inlet is 0.23 and the dimension of the rectangular plate is 8mm x 4mm
0.23[m/s]*(1-(x**2+y**2)/(4[mm])**2)
Hello, will this work if i model only half of the geometry and use symmetry?
Yes, you can make symmetry in that way.
how to put the parabolic velocity profile in ANSYS 19.1 version
You need to put UDF for this.
not getting EXPRESSION option in assigning boundary conditions to inlet.... please help
Share the screenshot of the fluent screen on our telegram group. Will try to find it out.
Thank you for tutorial, i want ask, I want to ask, I tried to make a truck model in Ansys 2020, but after meshing when I entered the fluent black screen setup, could it be fixed so the screen wasn't black ?
What are no of elements and nodes in your model.
@@AnsysTutorno of elemen and node the problem yes sir ?
Yes, might be one of the reason.
my ansys 19.2 doesn't have menu Expression Editor???
Check in latest version Ansys 20 R1 student version.
plz help me; how can I put expression for inlet velocity in 18.2 version
It's similar to this version.
and not getting named expression in side bar , i am using workbench 19.2
have you figure out this problem. actually i have the same problem and i am not able to figure out this.
Flow in x directuon, so r=sqr (z2+y2) !!!
For 2D case if flow is along x then its in xy plane or xz plane. For xy plane its similar as per the tutorial,but for xz plane you should take r =sqrt(x^2+z^2)
Sorry, can you make a stirring friction stirring simulation tutorial video using ansys ?,
I am very grateful to do that
We have not worked on this type of problem before. If you have any research paper on this then plz send it , will try to make tutorial on this.
Thanks for the helpful videos. Can you make a video in which the Fluent data is transferred to Excel to show flow profiles?
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This can be easily done in CFD post processing, you need to insert a line as the location & can import velocity at these probe points to excel as .csv file.
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how should I write the expression for 3D pipe, which extruded along z?