CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > FloEFD, FloWorks & FloTHERM

FloEFD CATIA Add-on - Closed Water Circuits

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 21, 2015, 14:14
Default FloEFD CATIA Add-on - Closed Water Circuits
  #1
New Member
 
Join Date: Dec 2015
Posts: 2
Rep Power: 0
Craze is on a distinguished road
Hello!

My Goal is to Simulate a simple (maybe not so simple for me) Desktop - Computer water cooling circuit, especially for the dimensioning of a radiator. (for example: is a 120mm radiator enough for a given thermal power)

I've done some simulations before with the radiator alone, where I got an inlet and outer boundary case with water (and a second in and outlet on he radiator for the Air - Fan) which worked without problems.

Now i want to simulate, if (and when) the water - temperature stays constant with a given thermal power (for example 300W) on a given surface, on which a copper block is placed on it, where the water flows through it.

My problem is, that I am missing a "pump" function to keep the closed water circuit (where no in and outlets are given) at for example 100 litres per hour flowing.

I've tried with the Vx, Vy and Vz settings inside the Fluid Volume setting, that shows some very weird water flow, which stops after a few minutes calculating and leading the copper block temperature to explode.

Also I tried with the "Local Region condition" on the inner surfaces of a straight part of the water - pipe with the same weird behaviors.

Or is it possible to create an inlet, where the fluid comes from the outlet? This would help also a lot.

Does Anybody know how to cope with this?

Thanks in Advance for everyone who can help!

Best regards,
Michael
Craze is offline   Reply With Quote

Old   December 29, 2015, 07:52
Default
  #2
Senior Member
 
Boris Marovic
Join Date: Jul 2009
Posts: 600
Rep Power: 20
Boris_M will become famous soon enough
Hi Michael,

I'm not sure if I correctly understood what you need, but I think you want to have a little pump that keeps the water circulating in your water cooling unit.
You can use the fan curves as FloEFD does not care if you move water or air it works therefore also as a pump for liquids.
Simply specify your pump curve as a new fan either according to the specifications of the supplier with a real pump curve or if you want to have a constant flow rate no matter what pressure loss then you can also specify it that way. Simply select then internal fan in the boundary condition and specify the surfaces where the fluid enters the system from the pump and where it leaves the system into the pump again. If the pump is interrupting the pipe then it doesn't matter you can simply create a small lid inside the pipe and use the two faces of the lid and if the pump is separate then you probably have two ends of the pipe between the pump would sit and can use the two surfaces of the lids on each end of the pipe for in and outflow.

I hope this helps,
Boris
Boris_M is offline   Reply With Quote

Old   December 29, 2015, 19:21
Default
  #3
New Member
 
Join Date: Dec 2015
Posts: 2
Rep Power: 0
Craze is on a distinguished road
Quote:
Originally Posted by Boris_M View Post
Hi Michael,

I'm not sure if I correctly understood what you need, but I think you want to have a little pump that keeps the water circulating in your water cooling unit.
You can use the fan curves as FloEFD does not care if you move water or air it works therefore also as a pump for liquids.
Simply specify your pump curve as a new fan either according to the specifications of the supplier with a real pump curve or if you want to have a constant flow rate no matter what pressure loss then you can also specify it that way. Simply select then internal fan in the boundary condition and specify the surfaces where the fluid enters the system from the pump and where it leaves the system into the pump again. If the pump is interrupting the pipe then it doesn't matter you can simply create a small lid inside the pipe and use the two faces of the lid and if the pump is separate then you probably have two ends of the pipe between the pump would sit and can use the two surfaces of the lids on each end of the pipe for in and outflow.

I hope this helps,
Boris
Hello Boris,

thank you very very much, it worked flawlessly.

What i've done: I created a small "plug" inside the water canal, where i could define the in and outgoing areas of an internal fan (which i created with no pressure loss, only 92.4kg/h mass flow).

It seems that the solver now needs plenty more time to calculate on my i7 4700mq, but that is a good compromise for the fact that it is working

here a picture of the solver:

Best regards,
Michael
Craze is offline   Reply With Quote

Reply

Tags
floefd

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
[PyFoam] and paraview eelcovv OpenFOAM Community Contributions 28 May 30, 2016 10:23
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 10:11
Simulating Water Splash Using a Particle System Zi-Wei Chiou Main CFD Forum 0 March 4, 2002 07:33
uptodate water distribution network fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 08:10
closed casing with fan and water Tom Main CFD Forum 0 August 27, 1999 02:16


All times are GMT -4. The time now is 04:54.