functionbasicFlowFunction_dp_der2
2nd derivative of flow function2nd derivative of function that computes mass flow rate for given pressure drop
Extends from Modelica.Icons.Function (Icon for functions).
Information
Function that implements the second order derivative of IBPSA.Fluid.BaseClasses.FlowModels.basicFlowFunction_dp with respect to the mass flow rate.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.PressureDifference | dp | Pressure difference between port_a and port_b (= port_a.p - port_b.p) | |
| Real | k | Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2) | |
| Modelica.SIunits.MassFlowRate | m_flow_turbulent | Mass flow rate where transition to turbulent flow occurs | |
| Real | dp_der | 1st derivative of pressure difference between port_a and port_b (= port_a.p - port_b.p) | |
| Real | dp_der2 | 2nd derivative of pressure difference between port_a and port_b (= port_a.p - port_b.p) |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | m_flow_der2 | 2nd derivative of mass flow rate in design flow direction |
Revisions
-
May 1, 2017, by Filip Jorissen:
Revised implementation such that IBPSA.Fluid.BaseClasses.FlowModels.basicFlowFunction_dp is C2 continuous. See #725. -
January 22, 2016, by Michael Wetter:
Corrected type declaration of pressure difference. This is for #404. -
July 29, 2015, by Michael Wetter:
First implementation to avoid in Dymola 2016 the warning "Differentiating ... under the assumption that it is continuous at switching".