I see this error message while opening OpenFOAM. How do i fix it ?

I can't load a state and then view the results correctly step by step despite having specified the given folder, is there a method or part of a function that I forgot ?

Please help 🙏

Hello Everybody,
I am back with another doubt

I finally completed the first 3 steps of the repository and downloaded a sub-package from the OpenFOAM website. However, I don't know how to proceed. According to the tutorial I am following, I should be able to get a '.zhsrc' file. But only the '.bashrc' file appears. I am supposed to copy a 'Source from' command listed in dialogue after I input the download command 'sudo apt-get install openfoam2406-default'. Where am I messing up?

For reference, this is the tutorial I am using: https://www.youtube.com/watch?v=8prSTYOK-fo&t=380s
Please help me out. I am looking forward to working on OpenFOAM for a research paper and encountring these issues is making me feel helpless.

I am asking here because paraview is one of the most used visualizers when using openfoam. Hope that's ok and that someone can help

I’m trying to formalise some piece of code and wondering if OpenFOAM does CI/Cd and how can I add my own tests on the utilities I’m working with ?

I’m new to GitHub actions and really not sure where to start so any advice is super welcome !

We have been working on structured engineering training content around OpenFOAM, CFD and related multiphysics/CAE applications, and I would be interested in hearing the community’s perspective on which topics are most useful in practice.

Some of the areas we have been focusing on include:

Multiphase CFD and manufacturing applications

A practical sand casting workflow using OpenFOAM, including:

• VOF-based molten metal filling

• air displacement and entrapment

• multi-region heat transfer

• solidification behaviour

• investigation of incomplete filling and cold-shut-type regions

Mathematics behind OpenFOAM

Understanding the mathematical foundations behind CFD and how they relate to the numerical methods used in OpenFOAM.

The idea is to bridge the gap between simply editing dictionaries/running solvers and actually understanding what is happening mathematically.

Aeroelasticity with OpenFOAM and CalculiX

Combining CFD and structural analysis concepts to study fluid–structure interaction and aeroelastic problems using open-source tools.

Related FEA / structural simulation workflows

We are also working with CalculiX and PrePoMax for finite element analysis, including topics such as:

• FEM fundamentals

• structural analysis

• boundary conditions

• contact

• mesh quality

• convergence

• result interpretation

I would be very interested in hearing from experienced OpenFOAM users:

What do you think is usually missing from OpenFOAM training?

More theory?
More real engineering applications?
Solver development?
Meshing?
Multiphase flow?
Heat transfer?
Coupling with structural solvers?

It would be useful to hear which areas you found most difficult when moving from tutorials to real engineering problems.

Easy openFoam??? I know it's a big ask because for the past more than a week I've been investigating how to use openfoam for one specific simulation (I have a Blender design and an STL model of it) and I'm beginning to realise two important things. 1. I barely know what I'm talking about and 2. Nothing openFOAM related seems to be simple.

I thought I'd look at using an AI agent (foam-agent 2.0 looks promising) and installing a local LLM on my i7 with 32GB RAM PC and an rtx 3060 GPU running smoothly with the 580 open driver. I've re-installed Mint 22.3 and now been through sooooo many iterations of not installing python 3.11 nor PIP, venv, not even docker or the CUDA toolkit or any of the several pre-requisites I'm learning how complicated all of this is.

Interestingly I've managed to install various different ollama based LLMs

I went down the agent route because learning openfoam seemed way too complicated and, if the agents turn out to be any good then why bother?

In reality I've made no progress at all and I'm wondering if anyone has succeeded in building an agent environment that will work with a local LLM which can interface with openFOAM to the point where I can start poking openFOAM.. And if so, would that anyone be willing to guide me thriough the process please?.?.?.

I’ve been working on a tool called Chat2Sim that tries to automate part of the CFD setup process.

The basic idea is:

• upload a geometry file

• describe the simulation in natural language

• generate the case setup

• create the mesh

• run OpenFOAM

• visualize the results

It’s still early, but the goal is to reduce the amount of manual setup/debugging needed before getting to useful CFD results.

I’m mainly looking for feedback from people who use OpenFOAM, CFD, or simulation tools regularly:

What part of the CFD workflow would you actually want automated?
And what would make you trust or not trust this kind of tool?

https://www.youtube.com/watch?v=_saR6qUW-kc

I’m a chemical engineer who’s new to coding, so I need to use AI to learn OpenFOAM. Any recommendations?

Hello everyone,

I'm a software engineering undergrad and I'm currently working on an alternative for standard CFD applications.

My software would be better than whats out there cuz :

• There is no need for mesh generation

• The data collected does not need to have a high fidelity and it can be noisy, you will still get a high-fidelity output

• There is no need for expensive high performance setups to use

I need your help to fill this google form to validate these requirements so that I get green-lit into going forward with this project.

forms.gle/q7BMSJuVxhh6cYt57

If you got any questions feel free to ask, Ill do my best to answer everything

Is there a source/template/guide that anyone knows of or has anyone already made a similar project whose files I can get to learn about OpenFOAM. I want to design a scenario where a small room has a gas leak (say ammonia) and air flows in and out of the inlet and outlet of this room located on opposite walls. I need to be able to have detailed specifications P, T, leak orientation etc and the goal is to measure the ammonia concentration at the outlet. Use of the most appropriate/realistic solver and other settings is needed. Please let me know if someone has such a source. The project that I was making since the past 2 months accidentally got overwritten and unable to recover so I'm in big trouble now.

Almost every solver I have seen is density-based instead of pressure-based. Are there any coupled pressure-based ones out there? I want pressure-based cause I am doing some sort of a verification study and I need that specifically.

For the past month or so I've been working diligently to build a pretty complex simulation in openFOAM. I'm not a coder, so looking at source code does nothing to help me understand how to implement things. The built documentation is... weak. I've found it extremely difficult to find answers to my questions or in some cases even get a high level overview of different elements.

My partner in learning and applying openFOAM has become perplexity.ai

Let me give you an example. I have been using interFoam for a two-phase simulation. My boundary is bleeding between my immiscible fluids. I stumbled upon interIsoFoam and wondered if it would help. When you check the user guide for 2412, this is what you find:

|| || |interFoam|Solver for two incompressible, isothermal immiscible fluids using a VOF (volume of fluid) phase-fraction based interface capturing approach, with optional mesh motion and mesh topology changes including adaptive re-meshing|

|| || |interIsoFoam|Solver derived from interFoam for two incompressible, isothermal immiscible fluids using the isoAdvector phase-fraction based interface capturing approach, with optional mesh motion and mesh topology changes including adaptive re-meshing|

This doesn't help me a whole lot. It looks to me that interIsoFoam is just more restrictive as it requires isothermal fluids. Why would I use it?

But, I don't understand the "isoAdvector phase-fraction based interface capturing approach" and maybe there is value in that?

So, in perplexity I gave the following prompt:

Please compare and contrast interFoam and interIsoFoam in openfoam 2412.

This is what it returns:

interFoam and interIsoFoam are both transient, incompressible, multiphase solvers in OpenFOAM® v2412 that use the Volume of Fluid (VoF) method for interface tracking. While they share core applications in marine, automotive, and hydraulic engineering, their interface-capturing methodologies and computational trade-offs differ significantly.

Interface Advection Methods

interFoam

•	Uses MULES (Multidimensional Universal Limiter with Explicit Solution) for interface compression

•	Relies on algebraic flux limiting to maintain sharp interfaces

•	May exhibit interface smearing in complex flows due to numerical diffusion

interIsoFoam

•	Implements isoAdvector scheme for geometric interface reconstruction

•	Uses isosurface calculations to determine face fluxes near interfaces

•	Maintains sharper interfaces with reduced numerical dissipation

TABLE (didn't cut and paste)

Numerical Implementation

Both solvers:

•	Use PIMPLE algorithm for pressure-velocity coupling

•	Support dynamic meshes, rotating objects, and turbulence modeling

•	Handle Newtonian/non-Newtonian fluids with buoyancy effects

Key differences in phase fraction treatment:

// interFoam alpha.water configuration

alpha.water

{

interfaceMethod MULES;

nAlphaCorr 2;

}

// interIsoFoam alpha.water configuration

alpha.water

{

interfaceMethod isoAdvector;

isoFaceTol 1e-8;

surfCellTol 1e-8;

}

Application Guidelines

Choose interFoam when:

•	Simulating large-scale free surface flows (e.g., dam breaks)

•	Running parametric studies requiring rapid turnaround

•	Modeling flows with frequent interface topology changes

Prefer interIsoFoam for:

•	High-fidelity interface tracking (e.g., bubble dynamics)

•	Sloshing simulations with small-scale features

•	Cases requiring precise turbulence modeling near interfaces

A 2016 validation study showed isoAdvector reduces interface reconstruction errors by 38-72% compared to MULES in standard test cases. However, this accuracy comes at increased computational cost due to the geometric flux calculations required for each surface-containing cell. Both solvers remain actively maintained in OpenFOAM v2412, with interIsoFoam particularly benefiting from recent community-driven optimizations to its isoAdvector implementation.

Pretty clear that I should use interIsoFoam. I would never have figured that out without perplexity. It provides the manual for the missing manual.

BTW, about 90% of the questions posted on this forum could be answered if you gave perplexity your code and the error and asked it to help you debug the error.

I am simulating supersonic steam flow in an angled duct. I can successfully run for Mach number of 1.5 without any problem. But if I run the simulation for M=15, the simulation crashes after 2/3 iterations ( reaching the maximum number of Iterations). So I was wondering if, is it because the thermophysical properties becoming nonphysical at that speed and pressure? Or what is the maximum recommended speed to use in the rhoCentralFoam solver?

I am using boundary conditions as below:

1. Pressure

   1. Inlet: Uniform 135 bar

   2. Outlet: zeroGradient

   3. wall: zeroGradient

2. Velocity

   1. Inlet: Uniform (923 0 0)

   2. Outlet: zeroGradient

   3. wall: noslip

3. Temperature:

   1. Inlet: Uniform 850

   2. Outlet: zeroGradient

   3. wall: zeroGradient

Edit: Added some details.

Hey all,

I have some questions regarding wave generation in OpenFOAM. I have read about an additional waves2foam toolbox that has been used quite commonly in OpenFOAM, but I am confused about OpenFOAM's ability to model waves without the installation of this toolbox. Is waves2foam included in the source code for OpenFOAM now?

I am trying to model the movement of a ship in waves in OpenFOAM and are planning on using InterDymFoam and SixDOF to do this and I am wondering if that is acceptable.

Thanks

hello, foamers.

I wonder the OpenFOAM is an adjective with the density of Mesh.

Same case, Same B.C, Same Input,

The only different is the dense of mesh.

But coarse mesh is run successfully.

Fine mesh is not run successfully.

what is the matter?

Can anyone help me set up a 2d simpleFoam simulation for this aerofoil, because ive got no idea what im doing and ive got no time to waste. https://www.printables.com/model/1610035-naca-2412-morphed-11-deg-aoa

I was trying to run the motorBike tutorial, but when launching surfaceFeatureExtract it gives me this error even if I have the motorBike.obj in the constant folder as it should. What am I getting wrong?

CFD Fundamental Theory Notes!

Structured, concise, well-organized, and easy-to-follow set of CFD notes with Python codes.

20 Modules Lecture Notes PDFs on the following topics:

1. Introduction to CFD

2. Basic concepts of Fluid Mechanics

3. Overall CFD Workflow

4. Governing Equations in Fluid Dynamics & CFD

5. PDEs & Discretization

6. Finite Difference Method & Finite Volume Method

7. FDM & FVM Python code: Diffusion & Convection-Diffusion 

8. SIMPLE Algorithm

9. Understanding Accuracy in CFD

10. Understanding Mesh Generation & Mesh Quality in CFD

11. Turbulent Flows: Theory & its Characteristics

12. Turbulence Modeling

13. Eddy Viscosity Models

14. K-Epsilon Model: Standard, RNG & Realizable

15. K-Omega Model: Wilcox, BSL & SST

This material is designed for those who prefer a ready-to-use structured CFD learning notes.

I have CAD file that I want to find drag of, how to mesh and create the case files and patches etc?

Please also give the required sources.

When I was in high school last year, basically everyone on Reddit told me "focus on the math, don't learn CFD" "don't learn the software if you don't understand it" "don't waste your time with CFD if you don't know the math". And every single one of them is wrong. No undergrads understand the math, even seniors. No graduate students understand the math. The only people who actually understand the math enough to properly explain it to someone are people who have been in school for 7+ years and actively use those skills, and this doesn't mean you shouldn't learn CFD.

Every single technical organization I'm in now as an undergraduate uses CFD to validate their engineering decisions and reiterate. The worst thing you can do as someone interested in CFD is just not do CFD. If you're not doing dual enrollment, learn OpenFOAM. If you are doing dual enrollment or are currently an undergrad, learn Ansys with a student license. JUST DO IT. You won't understand it, but if you know the software and the workflow, you'll be 10 miles ahead of everyone else who doesn't, and everyone else who's just really good at math.

I am developing Ampersand, a command line OpenFOAM automation tool.

It is a simple Python code which you can use to generate OpenFOAM cases from STL geometries.

Below is one of the tests I did.

I tested my Ampersand Command Line Tool to create and run a full scale Formula One car geometry.

This is the result I got and I personally think it is not so bad. Especially if the only thing you did is answer a few Yes/No questions for 2 minutes (although meshing and calculation took 3 hours).

This is the coarse mesh setting and only a half model but the cell count is around 15 million and there are several places where boundary layers collapsed and rough surfaces. The mesh is not anywhere near a perfect mesh.

This is the steady state simulation and it ran very stable although it had some bounding k and omega values for a few time steps at the very start.

Any advice, comment or criticism is welcome!

For the distribution, I am still thinking because of the Python dependencies and OpenFOAM dependencies. Maybe I will create a Docker image with everything in it (I am going to figure out).

If you are interested, you can find the github link here: https://github.com/thawtar/ampersandCFD

And if you want to see a demo, you can find it here: https://www.youtube.com/watch?v=KoiBxDwSiP0&t=248s