Hello,

Thanks in advance for reading my post. I am trying to perform 2d flow simulation on residential gas burner. The purpose of the simulation is to quantify the amount of CO2 captured by the exhaust fan. I am having issues with defining air as my environment. I have defined a fluid subdomain on my burner surface with combustion products CO2, water vapor and methane. I have assigned a volume flow rate out the burners’ surfaces as a boundary condition. Also, I have used an external fan on my exhaust geometry.  I will attach my model for your kind evaluation.

My concerns are

1. 1) Mass fraction of Co2 is much higher outside the exhaust hood area which is an indication of no air in the surrounding. I am not sure how to define air in the surrounding.
   1. 2)     Similarly, the temperature outside the burner area is much higher than expected. As I said earlier when I define my fluid subdomain on the burner surface, I have defined the temperature to be 500K.

Please share with me your valuable comments to enhance my simulation and improve my results. Thanks again.

Message was edited by: Hamad Khaled I have uploaded my latest file "stove emission simulation" where I tried to do 3d flow simulation on my stove burners to simulate CO2 emissions. However, I was not able to get the mesh to be 3d and I wanted to know if I can define an equation to calculate the capture efficiency of my stove fan. I have assigned the surface right above the burners to be my fan and I wanted to calculate the amount of mass of CO2 going through the fan versus the total amount emitted. is it possible to do in SW? Thanks again.

Message was edited by: Hamad Khaled I have take a snapshot of the mesh attached. As you may say, the mesh does not cover the flow domain accuratley. Its more like a 2d surface mesh. Thanks a lot Mr. Katz for your continuous help.