Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
fluid flow: high velocity around pressure point constraint?
Posted 20.01.2012, 01:31 GMT-5 Fluid & Heat, Computational Fluid Dynamics (CFD), Geometry Version 4.2, Version 4.2a 1 Reply
Please login with a confirmed email address before reporting spam
Hi,
I am currently simulating a fluid flow model (laminar flow) and trying to analyze the flow field within an 2D axisymmetrical truncated ellipse.
I applied a pulsatile inlet flow rate and pressure constraint point (add from laminar flow>points>pressure point constraint) in the model (as shown in attached picture: pressure constraint point.tif).
By examining the result, it was found that high velocity magnitude existed around the pressure point constraint (as shown in attached picture: high velocity problem.tif). However I assumed the velocity at this site should not be this high but similar with surrounding regions (in blue colour).
Could anyone tell me why/what cause to this problem happening?
Looking forward for your help and reply. Thanks a lot!
I am currently simulating a fluid flow model (laminar flow) and trying to analyze the flow field within an 2D axisymmetrical truncated ellipse.
I applied a pulsatile inlet flow rate and pressure constraint point (add from laminar flow>points>pressure point constraint) in the model (as shown in attached picture: pressure constraint point.tif).
By examining the result, it was found that high velocity magnitude existed around the pressure point constraint (as shown in attached picture: high velocity problem.tif). However I assumed the velocity at this site should not be this high but similar with surrounding regions (in blue colour).
Could anyone tell me why/what cause to this problem happening?
Looking forward for your help and reply. Thanks a lot!
Attachments:
1 Reply Last Post 22.01.2012, 11:47 GMT-5
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
it's not easy to understand, I assume the inlet is the horizontal cut line on top, where you have a p=0 pressure point. But what about the outlet ?
If none, I assume its not tat wrong, as your 2D-axi will give some central flow and pressure increase (as the flow area is larger here) and you will get an outflow (through the inflow boundary around the lowest pressure point constrained to p=0
But again, I might be wrong as I might not have correctly understood all your BC's there
--
Good luck
Ivar
it's not easy to understand, I assume the inlet is the horizontal cut line on top, where you have a p=0 pressure point. But what about the outlet ?
If none, I assume its not tat wrong, as your 2D-axi will give some central flow and pressure increase (as the flow area is larger here) and you will get an outflow (through the inflow boundary around the lowest pressure point constrained to p=0
But again, I might be wrong as I might not have correctly understood all your BC's there
--
Good luck
Ivar