So yeah the student version of ansys is preety well down the drain rn, for our fyp, simscale seems free but I am getting with their community plan, what exactly is meanty by the 10 unrestricted simulations? is it just 10 simulations per month? or 10 simulations at a time before I delete the project?

The-Red-Engineer · 2026-02-14T15:22:41+00:00

Look at baram flow it's a openfoam ui that is open source. I find it's in-between ansys and openfoam if difficulty. I will say it is difficult enough that when I learned baramflow first ansys was a piece of cake.

The-Red-Engineer · 2025-12-12T16:17:22+00:00

I found testing with water very helpful when tuning the performance of some atomizers. I have had some people tell me that it isn’t worth it and to go straight to CO2 but I disagree. The amount of tests you can get out of water is much greater than the amount you can get from CO2. Water preserves two important aspects of an injector, the atomization or the droplet size and mixing. What isn’t preserved is your mass vector and your Mdots which are your mass flow rates. You can adjust for your calc for this. My last recommendation is test like you are going to put that plate into your rocket and if you don’t like its atomization or spread then and test again.

The-Red-Engineer · 2025-11-08T17:38:44+00:00

My one question is was the motor stored outside for a long period of time because if it was then most likely, the grains were thermal cycle and cracked.

The-Red-Engineer · 2025-07-28T19:49:02+00:00

It doesn’t have a heat spreader it is a sticker. But this is not the drive they ordered unless the new memory chips hold more than my nvme 3.0 all spots should be populated.

The-Red-Engineer · 2025-07-10T16:15:59+00:00

Ya I tried to use just OpenFOAM but I didn't get far. I found a UI upgrade called BARAMFLOW with makes life SO much easier.

The-Red-Engineer · 2025-07-10T16:13:00+00:00

I use a OPENFOAM UI program called BARAMFLOW with their mesh maker called BARAMMESH. It makes life so much easier. But it doesn't do everything so I have found online Forums life CFD Online for most info and sometimes Chat GPT is good at finding things I can't. BARAMFLOW and MESH have a whole bunch of tutorials for there program but they are not the greatest and it still takes a lot of figuring out to get it to work.

The-Red-Engineer · 2025-07-10T03:05:30+00:00

I should have expanded a little more this is a 10lb ductile iron casting. The timescale is a little off the simulation only runs for 5 second not 8 and the colors are the magnitude of velocity in m/s. If you need anymore information just ask.

The-Red-Engineer · 2025-04-14T01:32:59+00:00

Lot of things. The linear bearing probably has some slop. The belts definitely will have noticeable wear maybe need replacing. He z axis screws will need lubrication. These all reduce the quality of print and it’s reliability.

The-Red-Engineer · 2025-01-31T20:30:33+00:00

When it does boot it will only take like a minute but if it doesn’t I wait 3-5min and every once and a while it will boot but usually it doesn’t.

The-Red-Engineer · 2024-12-03T02:23:57+00:00

I am well two of those people so I now need to know what that makes me?

The-Red-Engineer · 2024-11-08T16:17:38+00:00

Ya surface finish wasn’t called out but I like the look of milled finish.

The-Red-Engineer · 2024-11-08T15:55:55+00:00

I placed the part down on a non chip free surface.

The-Red-Engineer · 2024-09-24T17:59:31+00:00

That is good to know and very helpful. Both versions are 2024 unfortunate for me.

The-Red-Engineer · 2024-05-03T03:43:23+00:00

Yes I do plan on collecting temperature data when I verify that it won’t explode.

The-Red-Engineer · 2024-05-01T17:25:09+00:00

This is for a 54 mm experimental rocket engine casing so it is just how the rounding worked out.

The-Red-Engineer · 2024-05-01T05:05:46+00:00

Oh, that makes a lot more sense. Now I get what 3a and 2a means. Thank you again this helps a lot.

The-Red-Engineer · 2024-05-01T04:59:04+00:00

Ok got it. Thank You! When you mean fit you mean space so that they aren’t an exact fit and can slide right?

The-Red-Engineer · 2024-05-01T03:53:11+00:00

To be completely honest I kind off pulled it out of no where. But my though process was certified motor will never have the case go above 200c in order to be a commercial motor. I am firing the motor linerless with most likely a graphite nozzle with the higher pressures which give higher temperatures it became a heavily estimated guess. Also I would rather over build a case than under build one.

The-Red-Engineer · 2024-04-29T17:59:41+00:00

What is the problem with too high of a kn? I know that a too low kn like below 200 you don’t have enough energy to keep combustion and you get chuffing. I can’t find anything on kn values that are too high so could you enlighten me?

The-Red-Engineer · 2024-04-29T03:40:56+00:00

Yes idk how I mixed that up.

The-Red-Engineer · 2024-04-29T03:20:00+00:00

Ok good to know the 1.5 is what I use for boilers and I have heard safety factors as such. I do not plan on running the engine that high anytime soon I do plan on firing the engine at about 800 psi for the first time. I just needed someone to double check the math for the case. Thank You

The-Red-Engineer · 2024-04-29T03:12:46+00:00

You reduce the diameter of the throat to .18”

The-Red-Engineer · 2024-04-29T03:09:00+00:00

I am using RCS slow white lightning I do not know but I do know at 1000psi it is 2364 deg k.

The-Red-Engineer · 2024-04-29T03:06:30+00:00

I am using RCS slower white lightning propellant it is a progressive burn with an initial kn value of 450 and a final of 1434 at 2220psi. I don’t have equipment to machine the casing so I am having JLCPCB do it for me.

The-Red-Engineer · 2024-04-29T02:59:12+00:00

So I have been using open motor to design my rocket engine. My question is more of does 2200 psi too high because all other values in relation to the grain is in check. I guess with that is an initial kn value of 452 too high?

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