Author(s): Arkady A. Atavin; Vladimir V. Tarasevich
Linked Author(s):
Keywords: Flow; Liquid; Pipe; System; Model; Calculation
Abstract: The complex pipe systems are considered. The computation of fluid dynamics in such systems is the widespread and important problem in practice. The considered problems belong to the category of graph-defined problems. The flows in such system may be considered as intermediate kind of flows between one-dimensional and spatial flows. The nonisothermal flows in quality of the general case are considered. The model of such flows is offered which represents in essence the further generalization of model of water hammer. The boundary conditions and initial data problem are discussed. The simplified model of a flow (in neglect by thermal processes) is offered regarding the considered network as system with the lumped parameters. The methods of calculation are considered. Some specific difficulties are discussed which are caused by the scale heterogeneity. The combined implicit-explicit method of calculation for unsteady isothermal flows is described. The suggested technique was used for computations of various real pipe systems. The examples of calculations are demonstrated: the flows in heat supply system, the pressure oscillation in hydrodriver of pressure die-casting machine, the transients in main pipeline of liquefied natural gas. The comparison to experimental data confirming good adequacy of models, is resulted.
Year: 1999