CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Why fan boundary condition in ansys fluent is not operate at operating point

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   January 31, 2022, 10:58
Default Why fan boundary condition in ansys fluent is not operate at operating point
New Member
Pattawee Aekarrechai
Join Date: Jan 2022
Posts: 1
Rep Power: 0
PTW99 is on a distinguished road
I am trying to model and validate the air flow in simple circular air duct i place fan boundary condition at 0.1 m right before outlet as you can see my system in Pic.1. I set an inlet as Pressure inlet and outlet as Pressure outlet (Pic.2,3) and i specify my fan curve with piecewise-linear (Pic.4). I plot the result of simulation an average pressure distribute in each cross sectional area (Pic.5) then i plot my system characteristic curve with fan curve to determine where the operating point is (Pic.6). But as you can see from the simulation result it has system head 28.3 Pa but the fan provide head at 77.3 Pa. I have no idea why it is not operate at the operating point.
Thank you in advance

** Blue circle dot is system head and blue triangle dot is system provide head
** I also try to extend the duct length but the result is still the same
PTW99 is offline   Reply With Quote


fan, fan analysis, fan boundary conditions, fluent, hvac

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Empty object Meshing and Fan boundary condition cfd_user_pune FloEFD, FloWorks & FloTHERM 8 February 13, 2020 05:25
Basic Nozzle-Expander Design karmavatar CFX 20 March 20, 2016 08:44
Radiation interface hinca CFX 15 January 26, 2014 17:11
[blockMesh] error EOF in blockMesh Ahmed Khattab OpenFOAM Meshing & Mesh Conversion 7 May 17, 2012 00:37

All times are GMT -4. The time now is 09:46.