`Modelica.Fluid`

library.
Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

Name | Description |
---|---|

basicFlowFunction_dp | Basic class for flow models |

basicFlowFunction_m_flow | Basic class for flow models |

Examples | Collection of models that illustrate model use and test models |

Function that computes the pressure drop of flow elements as

m = sign(Δp) k √ Δp

with regularization near the origin. Therefore, the flow coefficient isk = m ⁄ √ Δp

The input`m_flow_turbulent`

determines the location of the regularization.

Type | Name | Default | Description |
---|---|---|---|

Pressure | dp | Pressure difference between port_a and port_b (= port_a.p - port_b.p) [Pa] | |

Real | k | Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2) | |

MassFlowRate | m_flow_turbulent | Mass flow rate [kg/s] |

Type | Name | Description |
---|---|---|

MassFlowRate | m_flow | Mass flow rate in design flow direction [kg/s] |

function basicFlowFunction_dp "Basic class for flow models" input Modelica.SIunits.Pressure dp(displayUnit="Pa") "Pressure difference between port_a and port_b (= port_a.p - port_b.p)"; input Real k(min=0, unit="") "Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2)"; input Modelica.SIunits.MassFlowRate m_flow_turbulent(min=0) "Mass flow rate"; output Modelica.SIunits.MassFlowRate m_flow "Mass flow rate in design flow direction"; protected Modelica.SIunits.Pressure dp_turbulent(displayUnit="Pa") "Turbulent flow if |dp| >= dp_small, not a parameter because k can be a function of time"; protected Real kSqu(unit="kg.m") "Flow coefficient, kSqu=k^2=m_flow^2/|dp|"; algorithm kSqu:=k*k; dp_turbulent :=m_flow_turbulent^2/kSqu; m_flow :=Modelica.Fluid.Utilities.regRoot2(x=dp, x_small=dp_turbulent, k1=kSqu, k2=kSqu);end basicFlowFunction_dp;

Function that computes the pressure drop of flow elements as

Δp = sign(m) (m ⁄ k)^{2}

k = m ⁄ √ Δp

The input`m_flow_turbulent`

determines the location of the regularization.

Type | Name | Default | Description |
---|---|---|---|

MassFlowRate | m_flow | Mass flow rate in design flow direction [kg/s] | |

Real | k | Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2) | |

MassFlowRate | m_flow_turbulent | Mass flow rate [kg/s] |

Type | Name | Description |
---|---|---|

Pressure | dp | Pressure difference between port_a and port_b (= port_a.p - port_b.p) [Pa] |

function basicFlowFunction_m_flow "Basic class for flow models" input Modelica.SIunits.MassFlowRate m_flow "Mass flow rate in design flow direction"; input Real k(unit="") "Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2)"; input Modelica.SIunits.MassFlowRate m_flow_turbulent(min=0) "Mass flow rate"; output Modelica.SIunits.Pressure dp(displayUnit="Pa") "Pressure difference between port_a and port_b (= port_a.p - port_b.p)"; protected Real kSquInv(unit="1/(kg.m)") "Flow coefficient"; algorithm kSquInv:=1/k^2; dp :=Modelica.Fluid.Utilities.regSquare2(x=m_flow, x_small=m_flow_turbulent, k1=kSquInv, k2=kSquInv);end basicFlowFunction_m_flow;

Automatically generated Thu Dec 8 16:34:53 2011.