Boundary Pressure Different Than The Defined Transient Pressure Profile

Shalash · August 17, 2016, 12:05

Hello everybody,

I am currently studying a flow in a 90 degrees bent pipe, that is closed at one side (resonator). The flow boundary that I have is a pressure inlet, where I define a transient pressure profile for it (Sinusoidal wave).

As a sanity check, I am writing an output surface monitor file at the pressure inlet boundary, yet I am getting a different profile than my input.

It is worth mentioning that I am using double precision solver. My profile is having a resolution equal to my time step.

Any ideas?

Thanks in advance...

KS

Shalash · August 27, 2016, 04:05

I found the problem...it is the reversed flow through the single inlet/outlet boundary of my domain!

DRiver · August 28, 2016, 11:23

So, what did you do? Did you extend your domain?

Shalash · August 31, 2016, 10:18

No, I did not. I was just puzzled why the monitor at the boundary is not showing the profile I defined, which as I said was due to the reversed flow through the single inlet/outlet boundary of my domain.

Cheers,

Karim

August 17, 2016, 12:05	Boundary Pressure Different Than The Defined Transient Pressure Profile	#1
Shalash New Member Karim Shalash Join Date: Feb 2012 Location: Switzerland Posts: 7 Rep Power: 14	Hello everybody, I am currently studying a flow in a 90 degrees bent pipe, that is closed at one side (resonator). The flow boundary that I have is a pressure inlet, where I define a transient pressure profile for it (Sinusoidal wave). As a sanity check, I am writing an output surface monitor file at the pressure inlet boundary, yet I am getting a different profile than my input. It is worth mentioning that I am using double precision solver. My profile is having a resolution equal to my time step. Any ideas? Thanks in advance... KS

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August 27, 2016, 04:05		#2
Shalash New Member Karim Shalash Join Date: Feb 2012 Location: Switzerland Posts: 7 Rep Power: 14	I found the problem...it is the reversed flow through the single inlet/outlet boundary of my domain!

August 28, 2016, 11:23		#3
DRiver New Member Daniel Riveros Join Date: Nov 2015 Location: Genoa, Italy Posts: 14 Rep Power: 10	So, what did you do? Did you extend your domain?

August 31, 2016, 10:18		#4
Shalash New Member Karim Shalash Join Date: Feb 2012 Location: Switzerland Posts: 7 Rep Power: 14	No, I did not. I was just puzzled why the monitor at the boundary is not showing the profile I defined, which as I said was due to the reversed flow through the single inlet/outlet boundary of my domain. Cheers, Karim