The inlet and outlet boundary problem with the preference of mass flow

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00010669%3A_____%2F16%3AN0000076" target="_blank" >RIV/00010669:_____/16:N0000076 - isvavai.cz</a>

Result on the web

<a href="http://www.eccomas2016.org/" target="_blank" >http://www.eccomas2016.org/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The inlet and outlet boundary problem with the preference of mass flow

Original language description

We work with the numerical solution of the turbulent compressible gas flow, and we focus on the numerical solution of these equations, and on the boundary conditions. In this work we focus on the inlet and outlet boundary condition with the preference of given mass flow. Usually, the boundary problem is being linearized, or roughly approximated. The inaccuracies implied by these simplifications may be small, but it has a huge impact on the solution in the whole studied area, especially for the non-stationary flow. The boundary condition with the preference of mass flow is sometimes being implemented with the use of some iterative process, guessing the correct values (for the pressure, density, velocity) in order to match the given mass flow through the boundary. In our approach we try to be as exact as possible, using our own original procedures. We follow the exact solution of the initial-value problem for the system of hyperbolic partial differential equations. This complicated problem is modified at the close vicinity of boundary, where the conservation laws are supplied with the additional boundary conditions. We complement the boundary problem suitably, and we show the analysis of the resulting uniquely-solvable modified Riemann problem. The resulting algorithm was coded and used within our own developed code for the solution of the compressible gas flow (the Euler, NS, and RANS equations). The examples show good behaviour of the analyzed boundary conditions.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

BK - Liquid mechanics

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

ECCOMAS Congress 2016

ISBN

978-618-82844-0-1

ISSN

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e-ISSN

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Number of pages

19

Pages from-to

6979-6998

Publisher name

National Technical University of Athens

Place of publication

Greece

Event location

Crete, Greece

Event date

Jun 5, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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