Publication Date:
2019-07-13
Description:
Fluid and thermal transients found in rocket propulsion systems such as propellant feedline system is a complex process involving fast phases followed by slow phases. Therefore their time accurate computation requires use of short time step initially followed by the use of much larger time step. Yet there are instances that involve fast-slow-fast phases. In this paper, we present a feedback control based adaptive time stepping algorithm, and discuss its use in network flow simulation of fluid and thermal transients. The time step is automatically controlled during the simulation by monitoring changes in certain key variables and by feedback. In order to demonstrate the viability of time adaptivity for engineering problems, we applied it to simulate water hammer and cryogenic chill down in pipelines. Our comparison and validation demonstrate the accuracy and efficiency of this adaptive strategy.
Keywords:
Computer Programming and Software; Spacecraft Propulsion and Power
Type:
M17-5801
,
AIAA Propulsion And Energy Forum And Exposition; Jul 10, 2017 - Jul 12, 2017; Atlanta, GA; United States
Format:
application/pdf
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