CFD CFX Air con on and off timer

Peta247 · July 12, 2016, 07:09

I successfully modelled a bus with diffusers and door. I got the simulation running and can see the change in air temperature when the door is open but I want to close the door after a number of minutes

How can I achieve this??? I know there is a way but I need help ASAP

Regards,

Peta247 · July 17, 2016, 09:34

Can ANYONE help

Jan Smedseng · July 17, 2016, 10:04

The easiest was is, to make three differenz simulations.
1. Doors are closed
2. Doors are opend
3. Doors are closed again.

For each simulations, you initialize with the end of the previous one.
In CFD Post, you can combine the simulations. Then you can define a Key-Frame Animation in CFD Post, where you load another result file in a new key-frame.

You also can define a interface at the door and define, if she is active or not. If not, it is treated as a wall.

Peta247 · July 17, 2016, 10:12

Thank you very much Jan, I will follow your advise and post on here if I need more help. Thanks again

Cheers

Peta247 · July 18, 2016, 04:36

I am having trouble combining the simulations and creating a keyframe simulation with the combined results. Could you shed more light on this aspect? How do I combine all 3 results ?

Regards,

Student1989 · July 18, 2016, 11:07

When you are performing a transient simulation, you could write an UDF which sets the mass flow rate at the door to zero after the doors are closed.

If not, the suggestion of jan is propably a good method. You can save the data file after each time step. Read the transient procedure in CFD post.

July 12, 2016, 07:09	CFD CFX Air con on and off timer	#1
Peta247 New Member Nomen Ose Join Date: Jun 2016 Location: Melbourne, Australia Posts: 19 Rep Power: 9	I successfully modelled a bus with diffusers and door. I got the simulation running and can see the change in air temperature when the door is open but I want to close the door after a number of minutes How can I achieve this??? I know there is a way but I need help ASAP Regards,

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July 17, 2016, 09:34		#2
Peta247 New Member Nomen Ose Join Date: Jun 2016 Location: Melbourne, Australia Posts: 19 Rep Power: 9	Can ANYONE help

July 17, 2016, 10:04		#3
Jan Smedseng Member Jan Join Date: Jul 2013 Location: Berlin - Germany Posts: 36 Rep Power: 12	The easiest was is, to make three differenz simulations. 1. Doors are closed 2. Doors are opend 3. Doors are closed again. For each simulations, you initialize with the end of the previous one. In CFD Post, you can combine the simulations. Then you can define a Key-Frame Animation in CFD Post, where you load another result file in a new key-frame. You also can define a interface at the door and define, if she is active or not. If not, it is treated as a wall.

July 17, 2016, 10:12		#4
Peta247 New Member Nomen Ose Join Date: Jun 2016 Location: Melbourne, Australia Posts: 19 Rep Power: 9	Thank you very much Jan, I will follow your advise and post on here if I need more help. Thanks again Cheers

July 18, 2016, 04:36		#5
Peta247 New Member Nomen Ose Join Date: Jun 2016 Location: Melbourne, Australia Posts: 19 Rep Power: 9	I am having trouble combining the simulations and creating a keyframe simulation with the combined results. Could you shed more light on this aspect? How do I combine all 3 results ? Regards,

July 18, 2016, 11:07		#6
Student1989 New Member Martin Join Date: Dec 2014 Location: Graz/ Austria Posts: 8 Rep Power: 11	When you are performing a transient simulation, you could write an UDF which sets the mass flow rate at the door to zero after the doors are closed. If not, the suggestion of jan is propably a good method. You can save the data file after each time step. Read the transient procedure in CFD post.