Hi

I am building a model containing 4 different components connected to each other, and I have some problem with division by zero at time=0.

I have manage to solve a couple of errors of this kind but when I put on more components, another error of this kind will appear.

I have tried to give some start values for the variable that become zero using the following code.

parameter Real START = 1 * 10 ^ (-6);

Real evapMass(start = START);

Or

Real evapMass(start = START, fixed = true);

I have also tried to force the variable to be non-zero by writing, including other variables as well:

if time > 0 then

    evapMass = waterUse / 60;

  else

    evapMass = START;

  end if;

I have tried to go to the bottom with this by following and controlling every superior variable that is included in this variable and make sure that they are non-zero at time=0.

The error message from the last simulation:

C:/Users/ninawe/AppData/Local/Temp/OpenModelica/OMEdit/Evap_kyln.Examples.EvaporativeCooler.exe -port=2066 -logFormat=xml -w -lv=LOG_STATS

assert        | debug     | division by zero at time 0, (a=-1e-006) / (b=0), where divisor b expression is: if time > 0.0 then 0.01666666666666667 else 0.0 Debug more

Process crashed

Simulation process exited with code -1

Now to the question:
I might of course have missed something in my model that will cause this error but is there other ways to get rid of the “division by zero” errors in the initialization process, others than those I already have tried, or does someone have any tips on how to get around it?