CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Post-Processing

Calculating the air velocity and contaminants passing through a window

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 23, 2020, 07:19
Default Calculating the air velocity and contaminants passing through a window
  #1
New Member
 
Ben Simpson
Join Date: Dec 2019
Location: UK
Posts: 5
Rep Power: 2
b.simpson is on a distinguished road
Hi,

I am setting up a natural ventilation model using buoyantBoussinesqSimpleFoam in OpenFOAM-v1812. The model is currently a very simple box shaped room with a window on either side.

My current task is to calculate/predict the air velocity and the total CO2 concentration passing through the windows into the room and also leaving the room.

Could someone inform me of the method I should be using to accomplish this?

I am happy to provide more information regarding my model set-up if needed.

Thank you for any advise you can provide.

Kind regards,
Ben
b.simpson is offline   Reply With Quote

Old   April 7, 2020, 11:33
Default CO2 implementation - help
  #2
New Member
 
Marlen
Join Date: Dec 2019
Posts: 4
Rep Power: 2
Linea is on a distinguished road
Hi, I just saw your post and was wondering if you got any further on the implementation of CO2 in your model? I have to simulate natural ventilation as well and I am struggling with impleneting the CO2 relase of a person into the room.

Any help is really appreciated.
Linea is offline   Reply With Quote

Old   Yesterday, 10:02
Default CO2 Implementation
  #3
New Member
 
Ben Simpson
Join Date: Dec 2019
Location: UK
Posts: 5
Rep Power: 2
b.simpson is on a distinguished road
Hi Marlen,

I have CO2 implemented into my natural ventilation model. I did this by adding CO2 into the thermophysicalProperties file in the constant folder.

Code:
CO2
{
    specie
    {
        molWeight       44.01;
    }
    thermodynamics
    {
        Tlow            200;
        Thigh           5000;
        Tcommon         1000;
        highCpCoeffs    ( 4.45362 0.00314017 -1.27841e-06 2.394e-10 -1.66903e-14 -48967 -0.955396 );
        lowCpCoeffs     ( 2.27572 0.00992207 -1.04091e-05 6.86669e-09 -2.11728e-12 -48373.1 10.1885 );
    }
    transport
    {
        As              1.67212e-06;
        Ts              170.672;
    }
}
I need to sense check the thermodynamics and transport values.

I created an inlet object at the surface of my person object. I set a CO2 concentration in a CO2 file in the 0 folder and set an air velocity in the U file.

In the controlDict file I added a CO2 function in the functions section.

Code:
CO2
		{
			type    			scalarTransport;
			libs 				("libsolverFunctionObjects.so");
			writeControl       	timeStep;
			writeInterval      	1;
			active          	true;
			autoSchemes     	false;
			nCorr           	0;
			resetOnStartUp 		false;
			field				CO2;
			fvOptions       
			{
			 
			}
		}
I haven't validated my model yet so I cannot be 100% sure that this is working as expected.

Hopefully that helps.

Regards,
Ben
b.simpson is offline   Reply With Quote

Reply

Tags
buoyantboussinesqsimple, contaminat transport, natural ventilation

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



All times are GMT -4. The time now is 01:17.