Learning Forum

[jadhammoud34]

Hello everyone I just wanted to get information on what are the necessary steps to take when making the mesh and geometry design for my project and it's the following:
It consists of a room which contains an occupant represented as a cylinder and in front of him there's a computer represented as box placed on a table. I want to study how the flow is affected by the geat generation of both the occupant and computer as heat sources to see in the results the velocity and temperature profile. In the design phase, i drew all the parts and i added add frozen for the occupant, computer, laptop and table and performed a boolean on each to substract the room form them. I Don't know if i should set the room to fluid or not. Also for my inlet and outlet, i performed a face split on both faces of the room to have a supply grill represented as rectangle for both inlet and outlet. Also at the end, i put all my solids in one part so i don't know if that has any affect later on in meshing.
As for the meshing, i was hoping you could help me generate a good mesh for my study, and what are the necessary steps to do, and what are the proper named selections that i should select.
I have tried different simulation butbtge results where not great, especially for the temperature profile, it didn't show any change in temperature even near the heat sources. And in the setup, I'm still not sure on how to properly add the heat sources for both occupant and computer.
I would be really grateful if you helped me out, and i know i asked for a lot, but this project is very crucial, it is my final year project and i have to graduate this fall. I've tried so many times but it just keeps on failing.
Thank you very much

[Rob]

Some images would help.  

Check the following:

   All blocks are connected

   Room mesh doesn't go "through" either the person or computer blocks

   Gravity is on, and density varies with temperature (read the options for this)

   How are you adding the energy?

 

 

[jadhammoud34]

I had two options, either add the energy as heat generation rate W per meter cubed in the cell zones conditions for the occupant and computer by clicking on eacg and adding energy source. The second option was to add the heat generation rate in the boundary conditions and defining the occupant and computer as walls and adding the energy for each, but i wasn't sure if i should add them as heat flux or heat generation rate.

[jadhammoud34]

Also i didn't understand the mesh going through the occupant part. What do you mean by through and what should i keep in mind

[peteroznewman]

You made sure the room air mesh didn't go through the person or computer when you "add frozen for the occupant, computer, laptop and table and performed a Boolean on each to subtract the room from them".

[jadhammoud34]

Yeah i made sure to do so

[Rob]

It's always worth checking the mesh: but if you've carried out the steps correctly it's OK. 

Adding the energy depends on the model. Heat source and surface flux are both valid.