I need help with the set up in the subsonic
Is the direction of the arrows for the turns correct?
Second, I have boundary condition static pressure 25bar because the liquid hydrogen got out from a inducer. Is it right ?
Hi @vtsich, thanks for the post on the forum 
Please make sure to add a link to your project and share it with support! Many thanks
Best,
Igor
Hello, do you mean this URL?
I am sorry for the delay
I’m sure I made a mistake not setting a weight. But I don’t know what value to put.
These results aren’t right.
Hi @vtsich,
I’ve been taking a look at the solution fields of your completed run and they indeed seem a bit odd. However, I see that you’re trying to apply a non-usual fluid and a really high flow rate. As a sidenote, wouldn’t temperature be a relevant variable in this case due to the liquid nitrogen? For that you’d have to set the “Compressible” option to “on”.
Besides that, your mesh seems to be really coarse:
My advise would be for you to run one or two tutorials before getting started with your own simulation - so that you get used to working with the platform!
What about this one:
Then, you should be able to see some problems in your own setup and we can discuss further questions
Best,
Igor
Hello again. Thank you very much for your help. In my case the density is constant. The temperature is -255C because I have hydrigen in cryogenic condition. Ι have seen video of simscale that subsonic flow is food for pumps with very high flow.But I will try it with the compressible. I have three questions yet.
- Is entropy used as data in the subsonic for calculations? Because the liquid hydrogen was made from me and I haven’t changed the entropy and number Prt.
2)Before I run the program , I had seen a messege which
i had seen a message saying that Ι didn’t set g gravity. You may get wrong results. But I didn’t know what price to put.
- I am going to download my project again but it will be completed (with a inducer) this time. Do I need to create a new API key or can I import the project with the same key ?
Sorry to ask such boring questions but it is important
My geometry is exported from CFturbo program.
Hi again @vtsich,
As to your questions
- If you set the "Compressible option " temperature effects will be included in Subsonic. Entropy is generally not considered in the equations used (to my knowledge). We’re veryfying with the developing team
- You should insert the acceleration of gravity. The standard value \mathrm{9.81 \; m/s^2} usually works!
- You can use the same key
Does that help?
Best,
Igor
Thank you very much!
Hi @vtsich, here is the input from the dev team I promised:
There is no entropy equation in Simerics. There is only the Energy Equation, with various different physical models in play.
Best,
Igor
Hello again. I am sorry to bother.I have a very specific question. Ι I have a stator in my model which has a sphere. I want to rotate it. I’ll define it as rotating wall. Before I can this step , is it necessary to put material solid or or not necessary. I send photo.
Hi @vtsich, could you kindly make a new forum post with your question - we need to keep one topic per forum post
Don’t forget to post the URL to your project over there again!
Best,
Igor
Of course