Learning Forum

[Max4]

Hi,

when I try to change a boundary type from "fluid" (inlet with velocity) to "wall" using Events, I have the following error.

Error: CAR: invalid argument [1]: wrong type [not a pair]

Error Object: ()

Regards,

Maxime

[Amine Ben Hadj Ali]

Please check your setup: changing the BC is working for me. You can try executing a command if you struggle with the BC change.

[seeta gunti]

Fluid is a cell zone condition. You can use either Fluid or Solid where as inlet is a boundary condition. Please check the boundary conditions and edit it.

Regards,

Seeta

[Max4]

I have an inlet and an outlet with a moving piston.

Boundary Conditions : Inlet: Velocity

                                    Outlet: Pressure

I want to close the outlet for a time t1 (Outlet to Wall) and then open it at a time t2. What should I use for Type when I want to change the Outlet from Wall to Outlet with pressure?

 

What do you mean by " Setup " ?

 

Regards,

Maxime

[Rob]

You're looking for a pressure-outlet for the type in your post above. 

 

The original error means you've missed a setting somewhere: ie the wall doesn't have a temperature on it or similar. You should still be able to work with the case so look through all of the panels for a missing input.  If you have an injection what was that attached to? 

[seeta gunti]

You can right click on the boundary condition "outlet" and change to wall. It should work with no issues.

[Max4]

Thank you for your answers. The simulation is still running, but a problem persists in the changing of the boundary type. What may I use (Type) to change the outlet from Wall to an outlet with a pressure?

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Indeed, I have define at the beginning the outlet (pressure 0 Pa). At t=0s, it changes to Wall, and at t=0.033s, it should change from Wall to the oulet with pressure, which was define at the beginning.

Regards,

Maxime

[Rob]

Having looked & checked with a colleague the Define Event method you're using won't work. If you want to switch to an inlet you'll need to use a TUI (text window) command in the event. That command will start with

/define/boundary .......................     

Type that into the TUI and use Enter to show the available commands & q to move back up a level. 

[Max4]

I noticed this, and as a result I'm writing a Scheme file and then loading it to finally use with TUI Commands.

Thank you for taking the time to check this.

 

Regards,

Maxime

[saeideh hadavand]

i have the same problem.. i uploaded the case and data to the remote computer and try to run it in fluent, but yet i have this problem and have no idea what your proposed solution means... this error even happens when im defining materials again... on boundary conditions as well... initialization on the inlet shows no information that is defined as boundary condition..

[Rob]

Please create a new Post/Thread and add in more details, including the exact error message.