[AntonZ]

Hi everyone,

I am automatically starting a cfx5solver with a .def file from a command line. In order to change parameters I use -ccl <ccl_path> command.
The .ccl files are automatically produced by an external program.
In the original def file boundary conditions (BC) on exit are specified as static pressure.
Here is an example of the .ccl file:

BOUNDARY: Exit
Boundary Type = OUTLET
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Average Static Pressure
Pressure Profile Blend = 0.05
Relative Pressure = 1 [bar]
END
PRESSURE AVERAGING:
Option = Average Over Whole Outlet
END
END
END

And it works.
But at some point I want to switch to mass flow.
So I rewrite .ccl file for mass flow BC.

BOUNDARY: Exit
Boundary Type = OUTLET
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Mass Flow Rate = 1 [kg s^-1]
Option = Mass Flow Rate
END
END
END

But when this ccl is feeded to cfx5solver, it mixes the original pressure-BC and mass-flow-BC and obviously gives an error. Here is the copy from the .out file:

BOUNDARY: Exit
Boundary Type = OUTLET
Location = *******
BOUNDARY CONDITIONS:
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Option = Mass Flow Rate
Pressure Profile Blend = 0.05
Relative Pressure = Pressure_expression
Mass Flow Rate = 1 [kg s^-1]
END
PRESSURE AVERAGING:
Option = Average Over Whole Outlet
END
END
END

Did anybody had this problem? Ways to get round it?
One way is to make 2 .def-s : one with pressure BC and one with mass flow. But maybe there are some more elegant ways?

[ghorrocks]

You can't change boundary condition types with just a new CCL. You have to load up CFX-Pre and do the CCL change there to make that sort of a change. Likewise you cannot add or remove boundary conditions, domains or sub-domains by CCL only, they need to go through CFX-Pre as well.

[AntonZ]

Originally Posted by ghorrocks

You can't change boundary condition types with just a new CCL. You have to load up CFX-Pre and do the CCL change there to make that sort of a change. Likewise you cannot add or remove boundary conditions, domains or sub-domains by CCL only, they need to go through CFX-Pre as well.

Many thanks.

[ghorrocks]

You can script CFX-Pre. So this can be done all in a batch file/script file - but it is just a little more involved than a simple CCL change.

[AntonZ]

Originally Posted by ghorrocks

You can script CFX-Pre. So this can be done all in a batch file/script file - but it is just a little more involved than a simple CCL change.

Where can I read about scripting cfxpre? I mean, I know there is a big chapter on that in Help, but I haven't seen any proper implementation instructions.

[ghorrocks]

The help file is the reference for CFX-Pre. There is no other.