Publication detail
Comparison of two methods of mathematical modeling in hydrodynamic sealing gap
KRUTIL, J. FOJTÁŠEK, K. DVOŘÁK, L.
Czech title
Srovnání dvou metod matematického modelování v hydrodynamického těsnicí spáře
English title
Comparison of two methods of mathematical modeling in hydrodynamic sealing gap
Type
conference paper
Language
en
Original abstract
The aim of work is to compare two possible methods of mathematical modeling of hydrodynamic instabilities. This comparison is performed by monitoring the formation and evolution of Taylor vortices in hydrodynamic sealing gap. Sealing gaps are a part of the hydraulic machines with the impeller, such as turbines and pumps, and they have an effect on the volumetric efficiency of these devices. This work presents two examples of sealing gaps. These examples are closed sealing gap and modified sealing gap with expansion chamber. On these two examples are applied procedures of solution contained in CFD software (ANSYS Fluent 14.5). In ANSYS Fluent is two possible basic approaches of solution this task: the moving wall method and the sliding mesh method. The result of work is monitoring the impact of the expansion chamber on the formation of hydrodynamic instabilities in the sealing gap. Another result is comparison of two used methods of mathematical modeling, which shows that both methods can be used for similar tasks.
English abstract
The aim of work is to compare two possible methods of mathematical modeling of hydrodynamic instabilities. This comparison is performed by monitoring the formation and evolution of Taylor vortices in hydrodynamic sealing gap. Sealing gaps are a part of the hydraulic machines with the impeller, such as turbines and pumps, and they have an effect on the volumetric efficiency of these devices. This work presents two examples of sealing gaps. These examples are closed sealing gap and modified sealing gap with expansion chamber. On these two examples are applied procedures of solution contained in CFD software (ANSYS Fluent 14.5). In ANSYS Fluent is two possible basic approaches of solution this task: the moving wall method and the sliding mesh method. The result of work is monitoring the impact of the expansion chamber on the formation of hydrodynamic instabilities in the sealing gap. Another result is comparison of two used methods of mathematical modeling, which shows that both methods can be used for similar tasks.
Keywords in English
Mathematical modeling, CFD, sealing gap, flow.
RIV year
2015
Released
06.05.2015
Publisher
EDP Sciences
ISSN
2100-014X
Book
EPJ Web of Conferences. Volume 92
Volume
92
Number
5
Pages from–to
305–312
Pages count
8
BIBTEX
@inproceedings{BUT114522,
author="Jaroslav {Krutil} and Kamil {Fojtášek} and Lukáš {Dvořák},
title="Comparison of two methods of mathematical modeling in hydrodynamic sealing gap",
booktitle="EPJ Web of Conferences. Volume 92",
year="2015",
volume="92",
number="5",
month="May",
pages="305--312",
publisher="EDP Sciences",
issn="2100-014X"
}