Learning Forum

[manjuk]

I'm sorry, but I'm having the same issue I was having before where I try to create a discussion, but it keeps saying "Access Denied".

Can someone please help me create a discussion in the Fluid Dynamics category?

Thank you.

[Rob]

IT are looking at some problems (again), if you create the thread in here I'll move it later. 

[stac]

i am faceing the same issue

[Rob]

Restart the browser and check in a different browser. The original problem has been corrected, so let me know if that doesn't work. 

[manjuk]

Okay thanks everyone, I’ll try again later.

[manjuk]

Update: I'm sorry, I'm still having the same issue.

I've tried it on Microsoft Edge and Google Chrome.

[DrAmine]

Some posts require to be reviewed by Admins so be patient. Some of us are sleeping at nights.

[Rob]

There's nothing in the moderation queue, and I can't see any other posts from Manjuk so something weird is going on. I can't see anything on your user ID so don't think it's us.   Assuming you've done the reboots etc and checked for pop up blockers create the post here and I'll move it later. Make sure it's clear where I need to put it! 

[manjuk]

Thank you.

Unfortunately, when I try to post it here, it's not posting for some reason. I'm not even getting an "awaiting moderation" message that I usually get. Could it possibly be because it's too long?

[Rob]

Could be, we don't mind several shortish posts to outline a problem, just add a note in the original post to explain.  Your message from this morning (my time) was in the moderation queue, and it's likely I'll have to approve this one too.... 

[Vishal Ganore]

I could see that you can reply to this post. Would you post your next discussion text here? Are you copying text from somewhere else or typing in the editor?

[manjuk]

I'm copying from a Word document. I will try several different posts here to see if it goes through.

Title: Fluent - Issues with Boundary Conditions

Category: Physics Simulation - Fluid Dynamics

Tag: FLUENT

[manjuk]

"I'm trying to simulate a steady, 2D, internal, compressible flow through a channel. I have a pressure inlet (the flow is compressible so I can't use a velocity inlet) and a pressure outlet."

 

[manjuk]

"For the pressure inlet, the Reference Frame is Absolute, the Gauge Total Pressure is 691485 Pa, the Supersonic/Initial Gauge Pressure is 0 Pa (simulating a Mach number of 2), the Direction Specification Method is Normal to Boundary, Prevent Reverse Flow is checked, and the Total Temperature is 518.67 K."

 

[manjuk]

"For the pressure outlet, the Backflow Reference Frame is Absolute, the Gauge Pressure is 606174 Pa, the Pressure Profile Multiplier is 1, the Backflow Direction Specification Method is Normal to Boundary, the Backflow Pressure Specification is Static Pressure, the Average Pressure Specification Averaging Method is Weak, the Target Mass Flow Rate is 669.09 kg/s (the upper and lower limits of absolute pressure are 5000000 and 1 Pa respectively), and 518.67 K."

 

[manjuk]

"My problem is that when I try running the calculations, when I check the contours, the inlet boundary conditions seem to be completely ignored by FLUENT. For example, the pressure is way too high and the velocity is way too low. I believe this is due to the fact that my initial values are much closer to the outlet values, but this is because if they're too close to the inlet values (or even somewhere in the middle), then my residuals explode really quickly. They still explode even if the initial values are closer to the outlet values, but not until much later. How would you suggest I initialize this? Should I try patching different initial values at the inlet, outlet, and in the middle?

Any help would be greatly appreciated."

These are all different paragraphs for the same post. Thanks to everyone who's been helping me out!

 

[Vishal Ganore]

"For the pressure inlet, the Reference Frame is Absolute, the Gauge Total Pressure is 691485 Pa, the Supersonic/Initial Gauge Pressure is 0 Pa (simulating a Mach number of 2), the Direction Specification Method is Normal to Boundary, Prevent Reverse Flow is checked, and the Total Temperature is 518.67 K."

"For the pressure outlet, the Backflow Reference Frame is Absolute, the Gauge Pressure is 606174 Pa, the Pressure Profile Multiplier is 1, the Backflow Direction Specification Method is Normal to Boundary, the Backflow Pressure Specification is Static Pressure, the Average Pressure Specification Averaging Method is Weak, the Target Mass Flow Rate is 669.09 kg/s (the upper and lower limits of absolute pressure are 5000000 and 1 Pa respectively), and 518.67 K."

"My problem is that when I try running the calculations, when I check the contours, the inlet boundary conditions seem to be completely ignored by FLUENT. For example, the pressure is way too high and the velocity is way too low. I believe this is due to the fact that my initial values are much closer to the outlet values, but this is because if they're too close to the inlet values [or even somewhere in the middle], then my residuals explode really quickly. They still explode even if the initial values are closer to the outlet values, but not until much later. How would you suggest I initialize this? Should I try patching different initial values at the inlet, outlet, and in the middle?

Any help would be greatly appreciated."

[Vishal Ganore]

Dear Friend,

As you can see above, I have changed curved bracket to rectangular for "[or even somewhere in the middle]," and it worked. Our text editor is sometimes sensitive to coding loop words with brackets. It is a bug that we are trying to remove. 

Meanwhile, please go ahead and create a new post with a rectangular bracket, remove formating if any. It should work. 

 

 

[manjuk]

Thank you Vishal Ganore. I will try that.