zaključna naloga
Jan Sotošek (Author), Iztok Tiselj (Mentor), Boštjan Končar (Co-mentor)

Abstract

Ta zaključna naloga razišče natančnost numeričnih simulacij vrtinčnih merilnikov pretoka z odprtokodnimi programi. Mreža vrtinčnega merilnika pretoka s posebej zasnovanim zastojnim telesom je bila narejena s programom Salome-Meca, numerične simulacije so bile izvedene s programom OpenFOAM. Simulacije so bile izvedene pri različnih Reynoldsovih številih od 5000 do 50000. Rezultate simulacij smo primerjali s podatki, pridobljenimi s poskusi pri enakih Reynoldsovih številih. Glavni cilj naloge je natančno predvideti frekvenco nastajanja vrtincev in njeno linearno odvisnost z masnim pretokom. Simulacije so bile izvedene z različnimi simulacijskimi metodami, kot so metoda direktne numerične simulacije (ang. Direct Numerical simulation - DNS), metoda velikih vrtincev (ang. Large Eddy Simulation - LES) in metoda Reynoldsovega povprečenja po časovnih intervalih (ang. Unsteady Reynolds Averaged Navier Stokes - URANS). Pri višjih Reynoldsovih številih sta bili metodi DNS in LES računsko preveč zahtevni, zato smo simulacije za Reynoldsova števila nad 35000 izvedli le z metodo URANS.

Keywords

vrtinčni merilnik pretoka;metoda velikih vrtincev;numerične simulacije;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [J. Sotošek]
UDC: 532.5
COBISS: 74591235 Link will open in a new window
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Downloads: 27
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Other data

Secondary language: English
Secondary title: Numerical Simulation of Vortex Flow Meter
Secondary abstract: This thesis explores the accuracy of numerical simulations of vortex flow meters using an open-source software. Mesh of a vortex flowmeter with a specially designed bluff body was created with Salome-Meca and numerical simulations were performed with the OpenFOAM code. Simulations were carried out for different Reynolds numbers ranging from 5000 to 50000. Results were then compared to the experimental data at the same Reynolds numbers. The main goal of the study is to accurately predict the vortex shedding frequency and to demonstrate its linear dependency on the mass flow rate. Flow simulations were performed using different simulation techniques such as Direct Numerical Simulation (DNS), Large Eddy Simulation (LES) and Unsteady Reynolds Averaged Navier Stokes (URANS). However, at higher Reynolds numbers both DNS and LES simulations are computationally too demanding so only URANS was used at Re above 35000.
Secondary keywords: vortex flow meter;large eddy simulation;numerical simulations;
Type (COBISS): Final paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: 34 str.
ID: 13278681