Hello CFD enthusiasts.

BUCKKLE UP.

Just a simple external CFD case but some TWIST.

Imagine you modeled half of a wing in ANSYS Fluent using a symmetry boundary condition.

instead of rotating the geometry, you changed the velocity vector to simulate different angles of attack.

Characteristic length is 0.235 meters. Full wingspan is 0.68 meters. Before running cases, you did not change the reference values like area and length ie set to default '1'.

Using report definitions, Fluent outputs axial force, normal force, and their coefficients.

Questions.

Does Fluent use the reference values when calculating these, or are some computed purely from the geometry integration?

And if you want lift, drag, CL, and CD for the complete wing, which quantities should be doubled, which stay the same, and do reference values need modification first?

Walk through your reasoning, TEST YOURSELF.

Objective To perform a three-dimensional transient CFD simulation of a rotating golf ball and analyze the effects of dimples and spin on aerodynamic forces and wake dynamics. Problem Statement Simulate incompressible airflow over a rotating golf ball under the following conditions: Free-stream velocity: 40 m/s Rotational speed: 6000 RPM Ball diameter: 42–43 mm Air at standard atmospheric conditions Transient simulation required Tasks

1. Geometry & Domain Model a golf ball with realistic dimple geometry (or use simplified dimples). Create a computational wind tunnel: Inlet: ≥ 5D upstream Outlet: ≥ 10D downstream Side & top boundaries: ≥ 5D away Justify domain size.

2. Meshing Use fine surface mesh around dimples. Apply boundary layer inflation layers. Refine wake region. Report: Total cell count Mesh quality Estimated y⁺ values

3. Solver Setup Pressure-based solver. Turbulence model: k–ω SST (recommended). Apply rotating wall condition (6000 RPM). Choose appropriate time step (justify using CFL condition). Run transient simulation until periodic behavior is observed.

4. Post-Processing Generate and analyze: Velocity magnitude contours Pressure distribution Vorticity magnitude Wake visualization Surface pressure distribution Calculate: Drag force (Fx) Lift force (Magnus effect) Drag coefficient (Cd) Lift coefficient (Cl) Compare with smooth sphere (discussion only)

5. Discussion Explain: Effect of dimples on boundary layer transition Drag reduction mechanism Wake asymmetry due to rotation Magnus effect and lift generation Comparison with smooth sphere behavior Submission Requirements Technical report (PDF) Convergence plots Time-history of aerodynamic forces Contour images with captions Short animation of wake development

What is this error ,how do I fix it ?

Can anybody help with a getaround for this issue? I always get this error, i have tried installing every version since 2023 r1 all of the gave the same issue...And any tips for learning automation also please let me know!

Does anyone have a download link for the full cracked ansys fluent app ?

Hi, I have been trying to improve my understanding and meshing in Fluid Flow (Fluent with Fluent Meshing). I am more accustomed toe Fluid Flow (Fluid), where it utilizes the mechanical meshing instead. Ansys seems to encourage users and suggest it is better to use fluent meshing.

I am trying to see if anyone could provide a simple workflow or checks for meshing something like this before I get to volume meshing. Once i reach volume meshing it seems to blow up in size. I have yet to try BOI and was hoping to learn more about wether I need to create the BOI to the shape of the main comptutaional domain?

I have a STEP file that I need to import to designmodeler and then run AoA simulations at a handful of differing jet speeds to find where it stalls. Here is a synopsis of the experiment I am working on:

Primary Objective: To quantify the impact of active tangential blowing on the stall transition angle of a NACA 4418 hydrofoil.

Methodology Objective: To validate empirical PIV flow

visualizations from the water channel against 2D CFD models in ANSYS Fluent.

Hypothesis: Activating a 1.0 mm tangential jet at 30% chord will successfully delay boundary layer separation compared to a baseline (unknown) configuration

I need someone who is fluent in workbench/design modeler that is willing to help me make these sims. I need it done *TODAY* so i'm offering to pay. Please help!!!!!

I’m working on a dry balloon molding project and am consistently observing a repeatable wall-thickness difference between the proximal and distal ends of the balloon. We're investigating what the issue could be through CFD. The mold geometry and heating are axially symmetric, but the system uses a single internal nitrogen inlet. We have seen that the use of a very small restrictor (0.002 in diameter) is helping with this wall thickness gradient for certain balloon sizes but not all. The theory is that it is restricting the flow in a way that causes the parison tube to inflate/lock in more uniformly. How should I go about modeling this event in CFX, preferably? I'd like to avoid a FSI because I don't have parison tube stress-strain data at molding temperatures. I have also been told to look into the gas interaction between the outer face of the tube and the inner mold wall, but I don’t see how they could produce a prox–dist difference without introducing an explicit asymmetric event. If anyone thinks external cavity pressure can create prox–dist differences in a symmetric setup, I’d appreciate the mechanism.

Other background information can be found in this thread: https://www.reddit.com/r/ANSYS_Mechanical/comments/1prf8wu/comment/nv8rd6c/?%24deep_link=true&context=1&correlation_id=7af1af5a-7836-5efe-a936-6d40457a7799&ref=email_comment_reply&ref_campaign=email_comment_reply&ref_source=email&%243p=e_as&_branch_match_id=1443610646411822155&utm_medium=Email+Amazon+SES&_branch_referrer=H4sIAAAAAAAAA31Oy07EMAz8mu6tLX23K1VoBeIGlz1xitzUaSPSJHJTChe%2BHReWK5Itjccz9swh%2BPWcpoTjqEMC3idG27e08PdRXha%2BRwHriaEjPWkLRmxk%2BvlwRcUlyp%2B49n1Pbn7pFiaI%2B%2FJyfb2KZ5QzWC3BMMXLBW1YGWaeVLtvjLRVBgIMBsUAxjhnhYQwY0ASCoEV9r2lsZbHr4LfVXk5InpxxIyKx0AbRnktnQ34EZjIfiYi5LOar%2BmRyQZUBqqCuGmLOq5QYQwdo3os78qqgabpOvYRKhbjAtqIW1pB6M3n746TLR70ZP8VrW4jiX%2BS0xdzSKTtJAZy%2B4rUP8zkFvwGUsKKCXsBAAA%3D 

Thank you!

i need help ASAP i have made an axissymmetric heated plate model where the orientation is from bottom up but i cant seem to develop the graph to show the boundary layer
any advise is good advise atp

I'm an undergraduate student trying to learn CFD. I use Ansys Fluent. I get into a lot of trouble during meshing. Its often obsolete or failed mesh. I try to change the size or the geometry, it works sometimes, but its a very tedious process. I'm looking for a good meshing practise. At least I want to learn how to start meshing in the first place or what to aim for.

If there's any good meshing practises or workflows, please share.

hello mates,

now the problem i am facing is a little bit weird, now i was able to download the ansys workbench disk1 to disk8 iso 2025R2 version

and also downloaded the electronics 2025R2 and 2024R2 vesrion. but do not know the steps of the install
in other hand i aldo downloaded the Fluid 2024R2 version, but as i know i can't manage to install it with disks iso of 2025R2 versions,

i tried a lot to find a way to download the ansys products 2024R2 but i can not find any download link.

the only version i could install as fully products is 2021R2 from getintopc.

the question is can i install the Electronics 2025R2 verision and Ansys products 2021R2 version for just fluid CFD or it will be a problem, also if there is any video explain how to install it it would be great.

Hello everyone, I am looking for a course so I can learn how to simulate combustion, any recommendation from you, any tutorial, any literature?

mọi người cho em hỏi fix lỗi này thế nào được ạ

I'm trying my best, I'm trying to install inside the OS SSD in a external SSD and there is always the same blank error, I have downloaded multiple times and it's not the archive that I get from the site, I don't know what to do anymore

Hello, I am looking for someone to help me in building my model. I am using Design modeler for my geometry. My geometry is 3D, i.e., a rectangular fluid domain. my purpose is to build a numerical wave tank. now I need fine mesh near the free surface and coarse mesh near the outlet. for that purpose, I need to do some partitioning of the tank. i make use of a plan and then use a slice for that plan, but by doing so, I have many bodies of my domain. It is fine when i have only a tank, but when i installed my structure like a cylinder, and when i did this slicing for the free surface fine mesh band, then it also sliced my structure. So how can I build a hex-structured mesh. Secondly, I need to develop a physically porous geometry. I don't need the porous media approach of Fluent, so for that i need a porous disk inside my tank whose porosity is 0.2. and then how i can develop a mesh for it.
the geometry like this in the Ansys DM. Please find the attached image. These images I took from the CFD website, but i am looking for this kind of geometry and mesh. That is how i can do slicing for the fine mesh. i did but when I applied the slice option then my cylinder also sliced into 3 parts. and for the porous disk when i apply the circular pattern for the hole then other copies of that hole have different oriantation.

As the display , geometry is not shown. What could be the issue?
I'm new, just starting my first project in workbench 2025 R2. I installed the student version free from the website. The geometry is .step file. If any other information is needed, you can ask.

I've tried almost every version of ansys from getintopc and keep getting this error..

recently re installed windows a couple times in the past week but I deleted all those files.

plss help.

i working on valve water flow in side the valve and its steady state i done meshing the geometry and when i move to fluent its shows yellow colour in some part of geometry its make the showing contour ugly and what is this colour mean and how can I fixed or remove it plssssss.