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Mar-02-20 12:57:15
Topic:
Initializing error
Does Modelica have a difficult learning curve?
Category:
Usage and Applications
CTG wrote:
Simulation Setup, Translation flags, and activate the check box Enable old frontend for code generation?
This seems to have done the trick. So something wrong with the new frontend?
Mar-02-20 12:14:30
Topic:
Initializing error
Does Modelica have a difficult learning curve?
Category:
Usage and Applications
OMEdit Connected to OpenModelica v1.14.1 (64-bit)
OneMass.log
Mar-02-20 10:38:12
Topic:
Initializing error
Does Modelica have a difficult learning curve?
Category:
Usage and Applications
Hi,
I have been trying to teach myself Modelica by starting from the examples and changeing simple things here and there. Goal is to be able to create big thermohydraulic models for work.
My model compiles fine, but has multitudes of errors (division by zero) on initializing. It works fine when I uncomment the output definitions. However, I do not need these, and I do not understand why this creates an error.
Ideas anyone?
Code:
model OneMass "Cooling of one hot mass"
extends Modelica.Icons.Example;
parameter Modelica.SIunits.Temperature TAmb(displayUnit="degC")=293.15
"Ambient temperature";
parameter Modelica.SIunits.Temperature TMass(displayUnit="degC")=313.15
"Initial temperature of mass";
// output Modelica.SIunits.TemperatureDifference dTMass=
// heatCapacitor.port.T-TAmb "Mass over Ambient";
// output Modelica.SIunits.TemperatureDifference dTtoPipe=heatCapacitor.port.T-pipe.T_q
// "Mass over Coolant";
// output Modelica.SIunits.TemperatureDifference dTCoolant=pipe.dT
// "Coolant's temperature increase";
Modelica.Thermal.FluidHeatFlow.Sources.Ambient ambient1(
constantAmbientPressure=0,constantAmbientTemperature=TAmb, medium=Modelica.Thermal.FluidHeatFlow.Media.Water(), useTemperatureInput = true)
annotation (Placement(transformation(extent={{-60,-10},{-80,10}})));
Modelica.Thermal.FluidHeatFlow.Sources.VolumeFlow pump(
T0=TAmb,
constantVolumeFlow=1,
m= 1,medium=Modelica.Thermal.FluidHeatFlow.Media.Water(),
useVolumeFlowInput= false)
annotation (Placement(transformation(extent={{-40,-10},{-20,10}})));
Modelica.Thermal.FluidHeatFlow.Components.Pipe pipe(
T0=TAmb,
T0fixed=true, V_flow(start = 1),
V_flowLaminar=0.1,
V_flowNominal=1,
dpLaminar(displayUnit="Pa") = 0.1,
dpNominal(displayUnit="Pa") = 1,
h_g=0,
m= 1,medium=Modelica.Thermal.FluidHeatFlow.Media.Water(),
useHeatPort=true)
annotation (Placement(transformation(extent={{0,-10},{20,10}})));
Modelica.Thermal.FluidHeatFlow.Sources.Ambient ambient2(
constantAmbientPressure=0,constantAmbientTemperature=TAmb, medium=Modelica.Thermal.FluidHeatFlow.Media.Water())
annotation (Placement(transformation(extent={{40,-10},{60,10}})));
Modelica.Thermal.HeatTransfer.Components.HeatCapacitor heatCapacitor(
C= 10, T( fixed=true,start=TMass))
annotation (Placement(transformation(
origin={10,-60},
extent={{10,-10},{-10,10}},
rotation=180)));
Modelica.Thermal.HeatTransfer.Components.ThermalConductor thermalConductor(G=1)
annotation (Placement(transformation(
origin={10,-30},
extent={{-10,-10},{10,10}},
rotation=90)));
Modelica.Blocks.Sources.Ramp ramp(duration = 5, height = 10, offset = TAmb, startTime = 5) annotation(
Placement(visible = true, transformation(origin = {-136, -6}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
equation
connect(ambient1.flowPort, pump.flowPort_a) annotation(
Line(points = {{-60, 0}, {-40, 0}}, color = {255, 0, 0}));
connect(pump.flowPort_b, pipe.flowPort_a) annotation(
Line(points = {{-20, 0}, {0, 0}}, color = {255, 0, 0}));
connect(pipe.flowPort_b, ambient2.flowPort) annotation(
Line(points = {{20, 0}, {40, 0}}, color = {255, 0, 0}));
connect(thermalConductor.port_a, heatCapacitor.port) annotation(
Line(points = {{10, -40}, {10, -45}, {10, -50}}, color = {191, 0, 0}));
connect(pipe.heatPort, thermalConductor.port_b) annotation(
Line(points = {{10, -10}, {10, -20}}, color = {191, 0, 0}));
connect(ambient1.ambientTemperature, ramp.y) annotation(
Line(points = {{-80, -6}, {-124, -6}, {-124, -6}, {-124, -6}}, color = {0, 0, 127}));
annotation(
Documentation(info = "<html>
<p>
7th test example: OneMass
</p>
A thermal capacity is coupled with a coolant flow.
Different initial temperatures of thermal capacity and pipe's coolant get ambient's temperature,
the time behaviour depending on coolant flow.
</html>"),
experiment(StopTime = 1.0, Interval = 0.001),
uses(Modelica(version = "3.2.3")));
end OneMass;
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