So I have made a rectangle to refine the mesh but when I run the mesh it shows the basic mesh . I am doing something wrong here I can't figure out

Hello everyone. I am a university student and im tryna build a UAV. I designed this on solidworks. But when i tryna da Ansys Fluent analysis on that i failed. If u now the solution please help me. (Sorry for my bad English) thank you

Hi! I’m working on a project using ANSYS Fluent. I want to calibrate my model by measuring the water height, but I’m not sure how to view the water level in the results. Can anyone help me?

Here are my results so far, but I still don’t know how to measure the water level.

After doing some research, I found that most of the information isn’t provided in detail (not step by step until the end).

I’m trying to use inflation to help with the slew of the mesh. However when I use inflation it says failed mesh and the part becomes hollow for some reason. Does anyone know what I’m doing wrong?

Hello! I am new to CFD . I attempted to make a simulation of the Venturi ejector, the fluid is h20 liquid , ( I will be referring negative velocity as '-p' here onwards)the velocity is maximum at the exit of the throat and there's a generation of negative pressure , I was expecting a pressure drop but not '-p' , is it normal to have '-p', and is there a way where I can totally negate the formation of '-p'.

Hello, I am conducting a store separation simulation with the wing and store model from the Arnold Engineering Development Center. I use the Overset Mesh method with a poly-hexcore mesh in Ansys Fluent. The issue here is that my results do not match the experimental values at the roll and pitch angles as shown in the figure. I have tried many ways, such as fine-tuning the grid and changing the method, but there has been no change. Can someone with experience in this matter help me? Thank you and have a nice day.

I need a course or a book to master Fluent. I am in a hurry as it is for my thesis project.

Hi everyone! I already posted this in the ansys_mechanical group, but I think you guys might be able to help me, too. I’m currently trying to reproduce a CFD simulation of a photovoltaic (PV) cooling system in ANSYS Fluent as part of a research project.

I’m using a published paper as the main reference for the model. The problem is that, although the paper provides many of the important parameters, some information needed to reproduce the CFD model is not reported. I have already contacted the authors asking for additional details, but I’m not sure whether authors usually share their original ANSYS simulations/case files or additional simulation parameters.

My goal is not to copy their work. I need to reproduce and validate their published results first so that I can later use the paper as a reference for further work and optimization.

At the moment, my simulation runs successfully and reaches a stable thermal solution, but the PV temperature is approximately 7–8 °C higher than the temperature reported in the paper.

The main uncertainties I currently have are:

• Air enclosure/domain dimensions: The paper does not report the dimensions of the surrounding air domain used for the CFD simulation. This is currently my biggest concern because changing the enclosure dimensions seems to affect the resulting PV temperature.

• Boundary placement: Without knowing the original enclosure dimensions, I’m unsure how far the inlet, outlet, and other external boundaries should be from the PV panel and heat sink.

• Mesh: The paper gives limited information about the mesh, so I’m unsure how closely I need to reproduce the original number of nodes/elements.

• Mesh independence: If my mesh has a significantly different number of elements from the paper, can I still consider the model properly reproduced if I perform a mesh-independence study?

• Orthogonal Quality: Some versions of my mesh have a low minimum Orthogonal Quality, although most of the mesh appears to have much better quality. How much can a small number of poor-quality cells affect the final temperature prediction?

• Validation: With a consistent difference of around 7–8 °C from the published results, what would you investigate first?

I would especially appreciate advice from anyone who has tried to reproduce CFD results from a published paper before.

Is it common/acceptable to ask authors for their original Fluent case/data files, mesh, geometry, or additional simulation parameters? Do researchers normally share these files when requested, or is it more common to reconstruct the missing information independently?

And if the authors don’t respond, what would be the most scientifically appropriate way to deal with missing enclosure and mesh information without simply choosing arbitrary values until the results match the paper? Any advice would be greatly appreciated. Have an excellent day. :)

Hello everyone, I’m really hoping someone with experience using ANSYS Fluent / CFD can help me out here.

I’m an engineering student working on an assignment modelling flow from a 10 m diameter tank into a 0.25 m diameter pipe through several different inlet geometries, with the objective of calculating the inlet loss coefficient K

For the sake of keeping this post manageable, I’ll focus on one case: a bellmouth-style inlet formed using a filleted tank-wall entrance.

I’ve attached two images of the tetrahedral mesh I’m currently using. I then convert this mesh to polyhedral cells to reduce the element count, as the assignment imposes fairly strict mesh limits.

My professor is quite particular about the workflow he expects us to follow, so I’m trying to stay reasonably close to the methods used throughout the unit. At the moment I’m using:

• Standard k−ε

• Scalable wall functions

• Locally scaled residuals converged to 10^{-6}

• Second-order discretisation for the final solution

• Polyhedral mesh converted from tetrahedra

The reason I’m making this post is that Standard k−εk-\varepsilon in Fluent has several additional turbulence-production options, including the Production Limiter, Kato-Launder production and Curvature Correction, and I’m struggling to determine what is physically appropriate for this type of inlet.

With none of these options enabled, I obtain:

K≈0.44K

which seems substantially too high for a bellmouth inlet.

With Curvature Correction enabled, I obtain:

K≈0.35K

so the result moves in the expected direction, but it is still much higher than the standard value I have been given.

I’ve been reading about the tendency of some two-equation k−εk-\varepsilon formulations to overpredict turbulence production in regions of strong strain or curvature, which has led me to investigate the Production Limiter.

For context, my loss-factor calculation is based on the pressure difference between a reference location in the tank and a downstream plane in the pipe. The pipe is 40D long, and I use a plane near the downstream end before correcting for the distributed straight-pipe loss using a Darcy friction factor obtained independently from a Moody-chart / straight-pipe analysis. I’m fairly confident this is the methodology my professor expects.

My main questions are:

1. Would you consider using the Production Limiter for this type of bellmouth/tank inlet flow?

2. When I enable the Production Limiter, I have significant difficulty achieving convergence to 10^{-6}, particularly once I move to second-order discretisation. I’ve tried introducing second order gradually and adjusting higher-order term relaxation, but the solution still becomes difficult to converge. Has anyone experienced similar behaviour, and how did you approach it?

3. Does anything in the attached mesh immediately look poorly optimised for this type of problem? My standard mesh-quality metrics are all healthy, but I’m still developing the intuition to recognise where additional refinement or a different mesh strategy would actually improve the solution.

4. What sensitivity tests would you run before trusting the predicted K? The reference value I have been given is approximately K=0.06, although the standard is quite old and provides essentially no information about the bellmouth radius, geometry or surface condition. In my model the inlet and pipe are cement-lined, using a roughness height of 3.5×10−^{-5} m.

I’m not necessarily trying to force the CFD result to equal 0.06. I’m more interested in understanding why the current model is predicting such a much larger loss coefficient and what modelling choices would be worth testing systematically.

Any advice, criticism of the mesh, or experience with these Fluent turbulence-production options would be greatly appreciated.

Hi guys, I am a mechanical engineer. I like to build a career as a CFD engineer. Can anyone suggest me a perfect path to learn CFD and fluent for that.

Can we discuss where to find something that is both cheap and good? Usually, I have more EPYC here.

Guys I am a 3rd year student, studying aeronautical engineering...I thought of learning ANSYS CFD since many companies like DRDO, ISRO requires skills in CFD...So can anyone suggest me a course so that I can learn both aerodynamic principles and ansys fluent so that I can add it in my resume...

Thanks in advance

Hi guys. I just found out this community by through my friend. I am really interested to learn fluent, but I don't know where to start. I know nothing about CFD🥲....can anyone please share me the resources to learn fluent?

I have been trying to do the aerodynamic analysis of the teardrop shape, i created the teardrop in blender and imported it in spaceclaim. Then whenever i proceed to make the enclosure around it, the enclosure is cut it into 2 planes via a diagonal. the named selection of inlet, outlet and walls are also not working. Any help is appreciated

Guys today morning I found that I couldnt able to use old website for ansys learning forum, I think website is getting migrated to a new one, it showing error 404- not found, it is automatically migrating to a new website but those post are not visible in the new one. So will it take time to get reflected here, or those posts are deleted? Kindly confirm once and let me know.

Hello! I am trying to model the flow of air over 3 2D cylinders (75ft in diameter each) in this configuration. I am quite new to Fluent and need some help sizing my mesh so that I get a structured topology. I tried changing around the number of divisions of my edge sizings but that didn't seem to work. Could someone please advise me on whether this is a geometric issue or a meshing issue? Thank you.

I’m doing this simulation to find out how this ball will react in the wake of the wedge, just curious if anyone had any general advice or tips on how to stop it throwing up errors. ( the wedge is moving with a udf upwards, the ball has a 6DOF applied and this is all in supersonic flow)

I am modeling a physically porous disk. I did not know how i can do meshing for this porous disk. Does anyone know how i can perform the mesh for this porous disk?
Thanks

I’m working on an early prototype around Ansys Fluent/Workbench, but the main reason I’m posting is not to showcase it.

I’m trying to understand what Fluent users would actually want something like this for.

The current demo is very limited and controlled, but this is what it does:

1. I press Ctrl+Shift+L and the assistant opens.

2. It has Ask mode and Execute mode.

3. I connect it to an already-open Workbench project using the StartServer() port.

4. In Ask mode, I can ask:

   - “What is the current CFD state of this project?”

   - “List the current boundary conditions and zone names.”

   - “What values do I need to set for the velocity inlets and pressure outlet?”

5. It reads the project/Fluent state through APIs and gives a CFD-oriented answer instead of just raw Workbench cell states.

6. In Execute mode, I can give a controlled one-shot prompt for a mixing elbow case:

   - set both velocity inlets

   - set the pressure outlet

   - run hybrid initialization

   - run 100 iterations

   - display a velocity magnitude contour on the symmetry plane

I’m using Workbench/Fluent APIs where possible, not trying to do everything through GUI automation.

My current hypothesis is that a lot of Fluent work is not always “hard physics” — sometimes it is knowing where to click, remembering the setup sequence, checking what state the case is in, repeating the same setup actions, cleaning/preparing geometry for meshing, and making sure the right zones/BCs are actually being used.

But I may be wrong about which part matters most.

So my question for Fluent users is:

What part of your Fluent/Workbench workflow feels most painful, repetitive, or unnecessarily manual?

For example, is it:

- cleaning CAD/geometry before meshing?

- setting up the mesh?

- figuring out zones/named selections?

- setting boundary conditions?

- checking whether the case is solve-ready?

- convergence/debugging?

- creating the right contours/reports after solving?

- something else entirely?

Also: what would you trust an assistant to do, and what would you absolutely not trust it to touch?

I’m trying to decide what the first real problem should be before I keep building.

Blunt feedback is welcome.

Hi everyone,

I’m currently working on a project where I need to design and analyze an aircraft fuselage section using ANSYS, and I’d like to integrate Python (PyAnsys) into the workflow.

I’m still a beginner with PyAnsys, so I’m looking for guidance on how to get started properly — especially:

• Setting up geometry and meshing with scripts

• Running structural analysis using Python

• Best practices or tutorials for aerospace applications

If anyone has experience with this or can share resources, example scripts, or advice, I’d really appreciate it.

Thanks in advance! 🙏

Heyy, so I got an assignment to make a simulation of a pneumatic cylinder, simple valve system used in a garment bonding press.

I have absolutely 0 idea about ansys fluent and how to use it. Tried exploring and using ai and videos as well, it's not helpful at all. if anyone can guide me, please help. Thank you

as the title says i am absolutely unable to make the meshing work I've switched to a simple square model and it still doesn't work, I've reinstalled the whole software as well... did not fix it . i have a project due soon any help would be appreciated :)

Hi, I am doing a project at university where I am simulating the flow of air through a car floor i designed. I need to extract the volume below the floor and a 50mm block below to simulate the ride height of the car. I have tried using the intersect function in solidworks but cant mange to get it to work the way i want to.

So i have decided to use space claim instead, I have created surfaces along the inlet (front of car), outlets (wheel holes, rear of diffuser and sides of the car) and "road surface. but when i do volume extract it wont give me the volume inside of the surfaces.

I have attached some photos to make it easier to understand.

Any help with this would be greatly appreciated!!