Hello,

I want to export large-scale models from Openmodelica to FMU for model exchange.

As first step, I'm using this model for testing purposes:

model BigModel "Tank-Pipe-Tank cloned n times"

 

  //

  constant Real g=9.8;

  //

  parameter Integer n = 1;

  parameter Real A_a = 1;

  parameter Real A_b = 1;

  parameter Real c = 0.2 "Kinematic viscosity";

  parameter Real rho = 1000.0;

  //

  Real P_a[n];

  Real P_b[n];

  Real H_a[n] (start=fill(2,n),each fixed=true);

  Real H_b[n] (start=fill(1,n),each fixed=true);

  Real F[n] "Flow";

  

  

equation  



for i in 1:n loop

  P_a[i] = rho * g * H_a[i];

  P_b[i] = rho * g * H_b[i];

  F[i] = c * (H_a[i] - H_b[i]);

  A_a * der(H_a[i]) = -F[i];

  A_b * der(H_b[i]) = F[i];

end for;

    

end BigModel;

Changing "n" we can generate big models.

Depending on the OpenModelica version and the OS, the maximum number of equations changes a lot:

Windows 10 64 bits - OM 32 bits - 16 GB RAM - 4 CPU - i7) => n = 2600; Equations = 13000
Windows 10 64 bits - OM 64 bits - 16 GB RAM - 4 CPU - i7 => n = a lot less than the previous one
Ubuntu 17.10.1 64 bits - OM 64 bits - Virtual Machine - 8GB RAM - 1 CPU=> n = 22500; Equations = 112500

Does this have any sense for you?

Is it possible to reach n = 22500 in Windows?

Thanks!!!