I am aware of none that fits your description.

Here are other possible options (that do not fit your description).

The open source (i.e., "FREE" as you put it) CFD package for general use is, of course, OpenFOAM. Two teams are working on it: openfoam.org (https://openfoam.org/) who are the original creators of OpenFOAM and openfoam.com (https://www.openfoam.com/) who want to commercialize the thing. The .com team has a good in-built mesher. The .org team doesn't have one and I used French opensource package Salome for meshing and, actually, CAD (https://www.salome-platform.org/).

OpenFOAM - being an open-source package - does not have GUI. Everything is done via console there. From this perspective, learning OpenFOAM is much harder than learning, say, ANSYS. Also, OpenFOAM is just a CFD package. In other words, to create a CAD model of your setup you have to use some other software of your choice (dependently on the case, I would recommend Salome), to mesh your CAD model you have to use some other software of your choice (I would recommend Salome), to visualize your results you have to use some other software of your choice (Paraview is what everyone uses).

If you don't want to mess with all that and, as somebody without experience, want convenience, you'll have to pay. ANSYS is the way to go. I don't remember how much their license cost, honestly speaking. But they do have academic discounts and, probably, student discounts. ANSYS have several CFD solvers. Go with FLUENT solver. ANSYS has a nice GUI and all the other steps (CAD, meshing, visualization) are seamlessly embedded in it. It is easy to just start working in it without prior experience.

And the last note: you can't just do CFD. You must have extensive knowledge in fluid mechanics to do CFD. It's not like you open your software, hit the button and, miraculously, get the result. Normally, CFD course is a graduate level course - not an undergraduate one. However, these days there is a high demand for CFD workforce and, unfortunately, the requirements for the person who does CFD have been substantially reduced. If you are going to do "button push till you have something visually nice", you can get away with it. If you want to publish in a respectable journal that knows something about fluid mechanics, you won't get away without taking fluid mechanics courses.

hello ivan , thank you for your answer.

Yep , I already enrolled in a few courses in December to understand the physics behind the program (from Cornell University). I have a Phd in physics applied on material physics (I have already used programs such as MD, COSMOL etc ...but the application was mainly on dense materials).

I was already thinking about ANSYS myself and your response confirmed my choice.

Thanks again

Joseph

Well, if you go with ANSYS, then the I must give you another advice: when you work in ANSYS, use workbench. Do not launch a CFD solver directly. This is such an important advice I was given when I started working in ANSYS. To open workbench, go to Windows menu, type ANSYS and you will see a lot of ANSYS modules. Find the module called "Workbench" and launch it. Working from the workbench will give you the easiest ANSYS experience. Many people don't know about it and have really bad time with ANSYS. Joseph Gerges

Ivan Nepomnyashchikh thanks