Library of Technical Faculties, Maribor (KTFMB)
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Numerična obravnava problema aerodinamike vozil : magistrsko deloŽunič, ZoranObravnavali smo problem turbulentnega toka nestisljive viskozne tekočine v kanalih in okoli ovir. Reynoldsove enačbe smo zaključili z dvoenačbnim turbulentnim modelom in upoštevali vpliv trdnih sten ... z različnimi dušilnimi funkcijami. Odločili smo se za tri različne modele dušilnih funkcij: za Lam-Bremhorstov, Naganov in Fan-Lakshminarayana-Barnettov model. Sistem parcialnih diferencialnih enačb osnovnih zakonov ohranitve smo reševali z diskretno metodo končnih volumnov. Kontinuitetno in gibalni enačbi smo povezali z uporabo principa umetne stisljivosti. Konvektivne tokove smo računali po metodi karakteristik, difuzijske tokove in izvorne člene pa s končnimi razlikami (upwind in centralnimi končnimi razlikami). Za napredovanje po času smo uporabili eksplicitno metodo Runge-Kutta četrtega reda. Natančnost in konvergenco uporabljene metode smo preizkusili na preprostih primerih laminarnega toka. Izračunali smo tok v gnani kotanji, tok v kanalu s stopnico in tok skozi nenadno simetrično razširitev. Turbulentne modele smo testirali na primeru razvitega toka v kanalu, razvoja turbulentne mejne plasti v kanalu in toka v kanalu s stopnico. Testni primeri so nam služili kot ocena natančnosti in učinkovitosti uporabljene numerične metode ter kot kriterij za izbiro najustreznejšega turbulentnega modela. Zaključni primer je bil izračun tokovnega polja okoli avtobusa mestnega prometa ter izračun količnika zračnega upora.Type of material - master's thesisPublication and manufacture - Maribor : [Z. Žunič], 1997Language - slovenianCOBISS.SI-ID - 2825494
Author
Žunič, Zoran
Other authors
Škerget, Leopold
Topics
mehanika |
prenosni pojavi |
aerodinamika |
turbulenca |
dušilne funkcije |
numerične metode |
metoda končnih volumnov
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pisarna A-003 (FERI) MD ŽUNIČ Z. NUMERIČNA pisarna A-003 (FERI) MD ŽUNIČ Z. NUMERIČNA |
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Žunič, Zoran | 12653 |
Škerget, Leopold | 06428 |
Source: Personal bibliographies
and: SICRIS
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