So I've been playing with ANSYS to solve this problem I

>>7945132
http://stackoverflow.com/help/how-to-ask

>>7945141
I'd rather not receive replies at a rate of one per day.

>>7945143
Your not going to receive replies at all because you literally did not ask a question.

Read that page, you need it.

>>7945149
OH SHIT

I realized I copy pasted my question content, and forgot to copy the title (which had the question) along with it.

Guess that's why I'm getting shat on. Thanks for reminding, I'll make a new thread.

>>7945157
Just put the question here you faggot, don't need to do another thread

>>7945164
yeah well
fuck

my coffee is really running low, idiot levels critical

So uh, I got this question, pertaining to the field of Fluid Dynamics / Momentum Transfer / Transport Phenomena / Waterfuckery. What does the stream function actually do? Relevant fluid flow diagrams related to question included below.

and all the shit that comes afterwards is in the OP

>>7945169
The streamlines just represent the velocity of the fluid at that spatial point.

If you placed a small radioactive particle inside the fluid and monitored it you would see it flowing in the direction of the streamline.

What's happening in your simulation is called flowchoking, play around with the inlet pressure to see the different flow patterns and pressure gradients.

>>7945182
Well fuck my ass and feed me a nugget, I don't have ANSYS in my home machine, and it's currently midnight, so the uni computer lab isn't really a thing right now.

Here's some pics I took for different pressure settings, at least:

Stream line at 10 Pa inlet https://files.catbox.moe/kl13nd.PNG

Pressure gradient at 10 Pa inlet
https://files.catbox.moe/d2igc6.PNG

Stream line at 50 Pa inlet
https://files.catbox.moe/0613a5.PNG

Pressure gradient at 50 Pa inlet
https://files.catbox.moe/xqwrff.PNG


Fuck captcha.

For now I'll settle with just figuring out what flowchoking is.

From the name itself, I'm just guessing that it's from the lowered area of the constriction, and the velo had to go up somehow, since the flowrate is constant.

With the surging rise of velo, I assume that's what's causing the slight vacuum, since the flow is close to being developed at that point, and it has to go below atmospheric pressure to account for any more rise in velo.

Does any of this make sense to you?

>>7945208
I meant increase the pressure, try ~500 Pa for a start and keep increasing it.

Also why are you doing this? Is this an assignment? What's the actual question? Or are you just playing around with simulations?

File: cfd assig 1 (pg2).jpg (179KB, 900x1600px) Image search: [Google]

179KB, 900x1600px

>>7945217
It's not really an assignment, but part of a training manual. If I want to understand shit in CFD, I figured that I oughta learn from these. Here's a screen of the booklet. Currently doing study 3.

I can't do shit at the moment. No access to ANSYS. I spent all day in the lab playing with this shit anyway, so I'd be a bit weary to deal with the software.

>>7945217
>>7945226
Oh, and I forgot to mention, the study 1 had Po settings at 100 Pa in part (i), but in part (ii) there's a bunch of pressure values.

I kinda figured out the developed flow thing just by evaluating the du/dx at various regimes of the flow, and seeing if the value is mega low enough. Throwing this out, just looking for disagreements in case I understood it wrongly.

You used ANSYS Fluent before? If not, what kinda CFD stuff do you use?

>>7945226
Right, so the most important thing you're supposed to notice is that the restriction increases the pressure drop (lowering the fluid pressure along the direction of flow) of the channel.

Also at the exit note the flow remains laminar in the centre and quickly develops to the expected profile, the vortex lines are also somewhat important because that causes strain and vibrations in your pipelines which fuck up your transport systems.

Beyond what the study tells you I also highly recommend you increase the inlet pressure several times and note the important differences in flow patterns. Draw your own conclusions as to what pressure ranges is better for your system (it's not what you think probably), notice what the pressure drops actually do to your flow patterns and how higher intial pressures change this pattern. This will help you develop invaluable intuitive feel about fluid transport designs.


Then go to bed.

>>7945248
I appreciate the input b-but

Muh maths

Isn't there like some analytical way of looking into this? Is there a way of implementing that thing I just learned a week ago (that Ψ thing)?

I literally can't sleep right now. I NEED to really make sure I have the right questions prepared to ask my lecturer tomorrow. He's gonna be on leave for like a week, and if I don't ask now, I'll highly likely forget what to ask later on.

Oh, and I played some intense dota matches. The adrenaline is also kinda still keeping me up.