Hi all,

Generally speaking is it difficult for foreigners (without PR) to get a CFD job in the states after graduating with a local master degree in CFD-related domain in the US?

Does ranking of university in the US matter when applying CFD jobs?

Thanks for sharing.

hey anyone here can help where do I start learning cfd analysis specially for marine vessels, it would be such a great help to me. Thank you

Hi, im new using ansys software, im following a tutorial but i have problems when i try to import the .scdocx file.

it look like this

i will be grateful if someone can help me please

Hey everyone,

I’ve been talking to CFD engineers and one thing keeps coming up—post-processing takes a ton of time. From scripting to troubleshooting unphysical results to making reports, it seems like a major bottleneck in the workflow. I’d love to get your thoughts on this:

What’s your typical post-processing workflow? Are you using built-in tools (Fluent, Paraview, Tecplot, etc.) or writing custom scripts?

What’s the most tedious part? Is it generating plots, interpreting results, setting up animations, making reports, or something else?

How do you usually spot and fix issues? Do you rely on experience, trial and error, or specific debugging techniques?

If you could automate one part of post-processing, what would it be? (Contour generation, error detection, reporting, trend analysis, etc.?)

I’m just trying to learn from those working with CFD daily—no agenda, no sales pitch, just curiosity. If you’re open to sharing, I’d love to hear what slows you down the most.

Thanks in advance!

I have the possibility of doing my thesis work using these simulations for fluid and thermal problems. Does it look good for a new graduate looking for a job in the field of cfd? In particular I am a nuclear engineer

Sup dudes and dudettes.

In short, I'm modeling turbulence for a plane channel flow in OpenFOAM using LES—so a rather simple setup. Basing my setup on the tutorial case periodicPlaneChannel with changing to larger domain. However, I don’t have much experience in effectively creating preliminary runs or generating turbulent velocity fields to import form precursor runs. I know there are several ways to do this, but that’s also making it harder for me to decide on a method. Since its a boring plane channel i picture it taking forever starting with laminar and letting it evolve naturally.

So, I was wondering if anyone has some nice tricks to share so I don’t have to reinvent the wheel. Like i have no idea what is the most time effective or whats the most accurate method. Just feels like a basic thing i should master if im to have any hope of doing this stuff for money.

There are many ways to Rome, but i rather skip going through Bosnia first if you catch my drift.

Really grateful for any help or tips that can get me on the right track.

Hi, fellow CFD Engineers. I am a CFD Engineer in India with nearly 3 years of experience. I am from Aerospace background but got diverted to automotive sector during my last job. I just followed that pursuit but regret it now. Indian Aerospace MNCs are not considering my application since most of them require past experience (mostly) with gas turbines.

Now, I want to go back to Aerospace CFD and at some point in the future work in the EU. What could be my best choices?

1. Should I join a aerospace masters program in a German/French University?
2. Good colleges wrt future prospects for Aerospace CFD?
3. What are the chances of landing a job in the EU directly from India? What sort of experience is required?

P.S. I have experience with aerodynamics and thermals on ANSYS Fluent.

Hey Everyone,

I am starting to work on heat transfer due to multiphase flow. Now, I want to simulate the same but in mixture of liquids. Basically, I will have 2 liquids, one liquid metal and the other will be a refrigerant. So, the refrigerant will vaporize and the liquid metal won't. So, does anyone have any references for research paper or any videos where they discuss phase change with an immiscible liquid?

Thanks for the help.

https://preview.redd.it/6wlojt6v0sge1.png?width=1314&format=png&auto=webp&s=c7df2c379e469008fa27b2bf7aa9518317e28d8a

https://preview.redd.it/4n4ujn6v0sge1.png?width=1003&format=png&auto=webp&s=1a12098cf2e1acbf331859c98f7c7375d49fa4e6

https://preview.redd.it/bgdk4t6v0sge1.png?width=1608&format=png&auto=webp&s=b06fa81d21fb9439004edbb1b448cbdd424853fe

https://preview.redd.it/np3iec6v0sge1.png?width=1473&format=png&auto=webp&s=4f5857f19aec8432df9a314e5f93d3803f0401f4

https://preview.redd.it/cmnmpc6v0sge1.png?width=1338&format=png&auto=webp&s=ded944c57b7d18dfe4b63c4533b9ed47865a887f

I'm hoping to get some help on some concerns for 1) flow detachment and 2) possible shock interference with the fins and destabilizing the rocket.

Q1) As for flow detachment, I found online from some Youtube videos on sims that as long as there are no points where the velocity is 0 along the flow it's good. However, I also found that wherever there is a 0 in wall shear stress flow is reversing indicating flow detachment. I have the wall shear stress scalar above. I'm not too confident about the theory of this so I was hoping to be pointed in the direction of where I can find more about this or what I should be looking for in the CFD for this.

Q2) Guessing based off of how wing sweep works in planes, I'm assuming that as long as the fins are inside the shock area, (ie: fins not touching shockwave by a good margin under it), the rockets stability should be fine. Is this right or am I missing something? I attached a quick sketch of a situation where the fins would be fine relative to the shock in case I'm being unclear.

Q3) You may notice in the pressure scalar that there are small shocks, these don't appear when I do the full body CFD. I'm not sure if it has something to do with me having the "body tube" extend across the entire section and that section being a freestream. My plan is to try it with a inlet outlet instead of freestream next to see if those go away since I'm not sure if it interferes with the actual solution. I have an image of the whole region and a shock that appears at the start of the freestream. My guess right now is that the initial shock (pictured by red circle) causes all those mini ones along the length of the tube. I made the tube is bigger than the freestream to try to avoid this, but maybe it didn't work. Is my assumption right, or is there something else going on?

Any and all feedback is appreciated! Thanks for taking your time to read <3 (Also sorry for double post those who saw this before, I didn't realize I had to add images in the text section and just clicked "images & video" after making the text for making the post so the text went away)

Hey,

I'll be staring ny Master's thesis this week to analyse the airflow around vertical axis wind turbine (VAWT) blades and have attached a general outline. Any suggestions on what would be the best opensource CFD software for this? I'm fairly experienced with ANSYS Fluent, but have never used any CFD software without a GUI like OpenFOAM. Haven't particularly used Ubuntu either so hesitating with using OpenFOAM.

Is there anything with a GUI? I'm expecting to run a Reynolds number of upto 10 million and the boundry layer effects are critical, so can't go with a student version mesh.

Note: the projects needs to be done using an opensource package.

I’m currently working on a CFD simulation using ANSYS Fluent to analyze airflow within a duct connected to an accumulator in an electric vehicle. The system involves two primary airflow sources:

1. Air flow at duct generated by the vehicle’s motion.
2. A fan inside the accumulator to assist with airflow.

Simulation Setup:

• Inlet: Pressure Inlet (using dynamic pressure based on vehicle speed)
• Fan: Fan boundary condition with a specified pressure jump
• Outlet: Pressure Outlet

Pressure inlet with initial gauge value due to air flow at duct. Specifially, dynamic pressure that i calculatet with air flow velocity

1. What do you think about that setup at the Fluent?
2. Is using a pressure inlet with dynamic pressure combined with a fan boundary condition (pressure jump) the right approach to represent this phenomenon? Or would it be better to use a velocity inlet in some cases?
3. When the air flow is relatively slow, is it possible for fan to contribute more flow to the airflow
4. If the air flow from duct is to big, and the fan can't contribute more energy to the flow, what will happen with the flow? is it will resist the flow or what?

Thank You

I'm a student and learning the fundamentals, mostly worked with fluent and openfoam, looking for jobs and many companies ask for Star CCM experience.

I am a senior mechanical engineering student currently working on a project that involves designing and improving the design of an aerodisc for motorcycles, I was told I would need to learn cfd to accomplish this by my professor, where should I get started (like youtube videos and tutorials) I would preferably like to learn this while learning how to use a software like ANSYS or some other tool to help speed up the learning process (I tend to learn better that way).

Hi there,

as the title says i wanna write a study work about a CFD-Simulation and later down the line possibly include a more sofisticated simulation into my Diploma for HVAC Engeneering.

My idea ist to analyse the air flow in a room with the following conditions. I want to look at draft as my focal point for now.

- central aircontidioning (2 Intakes 2 outlets)

- for now a cooling system idealy a regular airconditioning unit with forced konvection and using recyceled air from the room or a easier solution relying on free convection

Right now im wondering if this is to complex for an absolute beginner using CFD-Simulation or would it be douable, as i only got around 5 months till due date.

I hope my English isn´t too dreadful to read.

Thanks in advance!

I have to simulate slug flow in a pipe using ansys fluent as well as openFoam. Would be helpful if I can get some tutorials and literature to decide the parameters for my study!! Please do share of you have any material regarding multiphase flows especially slug flow

Hello, trying to model gassification with only 1 homogenous reaction and 1 hetrogenous reaction. I unfortunately I dont understand why this error is happening. See image below. Ive already ran a hydrodynamics simulation so its probably something to do with the species transport, I would appreciate any and all help.

https://preview.redd.it/jdc5p3aochge1.png?width=1239&format=png&auto=webp&s=cd7cb46bcac31a4c7811e4f79a63864b9c85b372

Case File: https://drive.google.com/file/d/1f-9ciOoKxprwSQbqmiIwkM2PLIul61aE/view?usp=drive_link

Hello guys, i want to install openfoam. I have windows system. I tried to install sublinux for windows but the system is lagging as a generic problem.

I want to create a new partition on my SSD to install linux as my secondary os. I am going to analyse the ship motions with the characteristics length between 0 up to 24 meters.

I have an external transportable ssd with a port supported high transfer speed. My computer also has the ss port.

What can be the best option to install to obtain better performance, on the internal SSD with partition as secondary os or on the external SSD? Thanks

Hello all,

I've been trying to perform a CFD simulation of a 3D wing. Since there is no aerodynamic data available for the airfoil profile I used, I ran two separate models, one using VSPAERO's VLM and another one using OpenFOAM potential flow using cfdof in freecad. OpenFOAM's mesh was created using the wing geometry exported by OpenVSP (as a STEP file), so essentially I should be getting similar results.

From what I found online, you get the force by integrating the normal and axial components from the pressure distribution using filters, resulting in a total lift force and total drag force. I would like to get your insight on which velocity should I use to calculate the coefficients from the forces given by the OpenFOAM results, since VLM uses 1 m/s freestream, using this velocity gives me absurdly high values for CL and CD.

I appreciate any help. If you have any further questions about my model please do not hesitate to ask.

Thank you!

https://preview.redd.it/xcq0askav8ge1.png?width=655&format=png&auto=webp&s=f1d0e0b9de0eb1ad69e55feb9d972117ced3a3fc

https://preview.redd.it/lrd9kskav8ge1.png?width=1280&format=png&auto=webp&s=0aa658fc5314ed8a289743131e57ad0769e43958

https://preview.redd.it/an7oe85wv8ge1.png?width=1282&format=png&auto=webp&s=6e41f7d72fb3daee671b8437276b8ac7347f13ca

Hello. I am very new to using expressions in Ansys Fluent. I am trying to get this zone of the mesh to rotate by 1.0472 rad/s until it reaches pi/6 radians and then stop rotating. When I include units I get the error: "name 's' is not defined"; however, when I don't include units I get the error that all arguments must have the same units. How can I fix this error, or is there a better way to achieve my goal? Thanks in advance for any help you can give me!

What are some good supervisors/labs one would suggest for working in the field of computational combustion (can be related fields as well like turbomachines flows, multiphase flows etc) especially in Europe (can suggest any other places)? If possible can someone mention their experience with the supervisor. Here 'good' means more on behavioural aspect and maybe some comments on labs that definitely needs to be avoided?

Hi guys.

Unfortunately i cannot provide any images, but i am trying to calculate heat transfer coefficient of a cooling jacket (water). I am using an older version of autodesk CFD. My boundary conditions are inlet volume flow, inlet water temperature, outlet pressure of 0 Pa and heat flow to water. My analytically calculated value of Reynolds number is about 5.5 times smaller and so is my expected heat transfer coefficient.

Has anyone ever had similar issues and can provide some suggestions?

Hi! I would like to ask something related to reactingFOAM simulation with LES. I'm working on spherical combustion and I'm doing both 3D and 2D scenario. I initially started on the 3D case and it's going well so far. I ignited the combustion by using local high temperature using setFields. The first video is the 3D case which shown the "flame propagation" through the movement of radial velocity on the right graph.

https://reddit.com/link/1idlvyg/video/8k7jnv6jk4ge1/player

Then, I copied the exact same configuration (controlDict, momentumTransport, etc) and apply it to the 2D case. However, as shown in the second video, the radial velocity is decreasing across the radius unlike the 3D case. I assume that the combustion reaction only occurs for a short time in the beginning and the combustion is not self-sustaining and hence resulting in decreasing radial velocity.

https://reddit.com/link/1idlvyg/video/43flvxpkk4ge1/player

I believe the treatment for 2D case is different than the 3D case, could anyone please give some insights or discussion regarding this problem? I highly appreciate it!

Dear CFDers and OpenFOAMers,

I want to create a room and then place human figures and tables inside it.

I have already done this in Salome by defining groups (inlets, outlets, humans—each human as a separate entity—tables, etc.). I meshed the entire geometry and refined the mesh near the boundaries.

Once I move to OpenFOAM, ideasUnvToFoam works normally, checkMesh runs without errors, but the internal elements are assigned to faceZones instead of being recognized as internal boundaries.

I have read several threads on this issue and tried multiple approaches:

-createBaffles: This generates faces for my internal elements, meaning my human models, for example, end up with human_master and human_slave surfaces. However, this is not what I need—I need the internal volumes to be defined as boundaries so I can use them for thermal purposes later.

-Manually adding faceZones to the boundary: I attempted to find the faceZones and add them manually to the boundary, but checkMesh then reported "multiply connected (shared edge)" errors for all internal elements.

Using topoSetDict: I tried creating sets for the internal elements with topoSetDict, then defining them in createPatchDict, but createPatch only works if the boundary already exists.

Here is an image of the geometry (for now, I have only included four humans and two tables as a test).

createBaffles seemed to work, and the simulation ran for a while, but I kept getting spikes in epsilon and k. Then I realized that createBaffles only generates surface faces rather than true 3D elements.

I can provide more details if needed. Thanks in advance for your help!

https://preview.redd.it/bbmdryq8h4ge1.png?width=2187&format=png&auto=webp&s=dee9cdd42cc1329d9f7d8736cf042dc87b4e2c75

Hello guys!

Does anyone here have experience writing code and/or working with the streamline method? I have never heard about this method in my undergrad studies, only got to know it very recently. Got to know the equations through the Schobeiri book, but I have no idea how to discretize them. I know there are some cool tools on github, like Turbo Design 3... but I didnt found no documentation for it.

Let me explain what I need: I want to design a blade cascade with a very specific blade loading/pressure coefficient distribution. I know that this can be done with the streamline method. Though Im aware that a pannel method would be better for this (in fact, Im trying to get a MISES MIT license for this), but Im still curious about what the streamline method could do for me.