[Lt72884]

Ok, so i have some questions and i am hoping to get some help. I am going to need a lot of help haha.

For the last few months i have been using a GUI for openfoam which has made simulations very nice and simple to run. This GUI is the cfdOF workbench in Ondsel engineering suit (fork of freecad) and its been a blessing to say the least.

all i have to do is double click something like PHYSICS and then pick my settings such as steady time or transient time, single phase, multiphase flow, isothermal, high Mach number viscous, etc etc. Then i move to fluid properties, initialize fields etc etc. I then can do mesh, mesh refinement based on extrusion, surface or volume, and then i can add a reporting function for forces and force coefficients. i mean, its very very nice.

However, i kind of want to try OF from the command line interface or however it is normally run without a gui.

So here is my question.

i have made a simple ogive projectile, a nose cone for a rocket of mine, as i build high powered rockets. IE, my prefect of my team, his rocket hit 300,000 feet.

so, i have this step file of a 3d nose cone i made, and now i would like to CFD the projectile.

when i did this with the GUI, i had the following:

a flow domain 10 times the size in all directions. A surrounded my nose cone with a 3d cube 10 times the size of the cone

4 volume mesh refinements. I did this by placing 4 cylinders centered around the nose cone, each cylinder twice the size of the other. Flow had a course mesh, then each cylinder was set to be a specific refinement so that the mesh on the nosecone was about 10mm for each cell.

the flow domain was set to open farfield with 750m/s in the x direction

RANS k-omega-sst
default 1.25kg/m3
HiSA solver was used.

got back results that matched openrockets numerical analysis.

So i would like to learn to do the same thing without the GUI

I have a 12 core cpu machine and 32gb of gddr4 ram. It handled the 3d case just fine. took about 10 minutes or less for 2000 iterations

Being honest and upfront, im going to need hand holding on this.

thanks to anyone willing

[Tobermory]

Your best bet is to book onto a training course - there you will be led through the process and gain proficiency rapidly. Otherwise, google for training course notes (eg Wolf dyamics) and try work through them yourself, using the tutorial cases as a starting point. I doubt that you will find someone with the time or goodwill to act as a personal tutor ...

[Lt72884]

Originally Posted by Tobermory

Your best bet is to book onto a training course - there you will be led through the process and gain proficiency rapidly. Otherwise, google for training course notes (eg Wolf dyamics) and try work through them yourself, using the tutorial cases as a starting point. I doubt that you will find someone with the time or goodwill to act as a personal tutor ...

interesting. I will google for course notes then. Once i gain proficiency in this, i will make youtube videos so others can learn quicker than i did. Try and help the opensource community out a little bit.

thanks

[Lt72884]

before i move on, i found that openfoam themselves have some training. I found the pdf of the tutorials in my OF install folder BUT for whatever reason, i do not have the tutorials folder that is supposed to be downloaded. How do i find those files and folders?

i am on windows 10. Is this why they are not available?

[Tobermory]

Not sure - I used OF under WSL many years ago, and I don't remember them being missing. But they may well be in your source pack.

Simple remedy: go to the OpenFOAM page (org or ESI) and download the linux source file pack that matches your OpenFOAM version - you will find the tutorials in there. You can discard the rest, of course.

[Tobermory]

On the subject of training, a quick google in YT found the following playlist:
https://www.youtube.com/watch?v=uNpM...mDChejiwm846Wl

I haven't watched these, but I do know that the Wolf Dynamics guys generate some really good training course material, some of which is freely available on the web. Good luck.

[Lt72884]

Originally Posted by Tobermory

Not sure - I used OF under WSL many years ago, and I don't remember them being missing. But they may well be in your source pack.

Simple remedy: go to the OpenFOAM page (org or ESI) and download the linux source file pack that matches your OpenFOAM version - you will find the tutorials in there. You can discard the rest, of course.

great minds think alike. I started doing htat last night... then fell asleep hahaha.

[Lt72884]

Originally Posted by Tobermory

On the subject of training, a quick google in YT found the following playlist:
https://www.youtube.com/watch?v=uNpM...mDChejiwm846Wl

I haven't watched these, but I do know that the Wolf Dynamics guys generate some really good training course material, some of which is freely available on the web. Good luck.

thank you for finding that. hopefully this is enough to get me going. I understnad the theory.. somewhat, i mean, fluid dynamics is hard material, but i did very well in the class and had an excellent professor who spent MANY hours with me as i ask A LOT of questions

[Tobermory]

No problem - and good luck!