Open
Description
Reported by kproelss on 28 Mar 2010 19:46 UTC
Pressure drop and heat transfer correlations for turbulent and laminar pipe flow are added to Modelica.Fluid
in MSL 3.2 with the new package Dissipation
. In order to make them available as choices in the pipe models already existing in Modelica.Fluid
several changes have to be made to these models. The main challenges are:
- Current correlations combine pressure changes due to friction and to static head, while the dissipation correlations only cover friction losses.
- All pressure drop or heat transfer choices require the same variable input (replaceable functions) or a common set of variable modifications (replaceable models).
- All pressure drop or heat transfer choices require the same parameter input (replaceable functions) or parameter modifications are applied to the redeclared model (and disappear if another choice is made)
- How can non-matching choice combinations be avoided, e.g. a two-phase pressure drop correlation and one-phase medium package?
- Robustness at flow reversal
- Redundant correlation choices must be avoided, while still maintaining backwards compatibility or at least conversion to equivalent physical behavior.
Migrated-From: https://trac.modelica.org/Modelica/ticket/344