Central Technological Library of the University of Ljubljana (CTK)
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Numerično modeliranje turbulentnih [!] tokov posplošenih newtonskih tekočin : doktorska disertacijaTernik, PrimožV pričujočem delu smo obravnavali turbulentni tok posplošenih newtonskih tekočin. Upoštevajoč statistični opis turbulentnega toka, pravila časovnega povprečenja in v splošnem spremenljivo viskozno ... funkcijo smo izpeljali časovno povprečene enačbe osnovnih zakonov ohranitve. Za tak sistem enačb je podan predlog modeliranja s k - E turbulentnim modelom viskoznega podsloja. Numerično modeliranje takšnega sistema enačb smo izvedli z uporabo metode končnih prostornin. Obravnavali smo diskretni zapis kovektivno-difuzivne oblike enačb posameznega zakona ohranitve, kjer smo z modifikacijo izvornih členov in uporabo fortranskih programov uspešno izvedli numerično modeliranje. Na primeru numeričnega modeliranja popolnoma razvitega laminarnega toka v kanalu smo proučili bistvene razlike, ki nastopajo med newtonskimi in nenewtonskimi tekočinami. Za opis dilatantnega nenewtonskega obnašanja smo uporabili Potenčni zakon in Kvadratni model, medtem ko smo newtonsko viskozno obnašanje opisali s primernimi vrednostmi parametrov Kvadratnega modela. Numerični razultati za tlačni padec so služili za oceno Reynoldsovega števila za Kvadratni model. Bistven del naloge zajema numerično modeliranje turbulentnega toka dilatantnih kot tudi psevdoplastičnih nenewtonskih tekočin. Proučili smo tri primere toka in sicer razvijajoč turbulentni tok v kanalu, turbulentni tok v kanalu s stopnico ter turbulentni tok v kanalu z nenadno razširitvijo. Dilatantno nenewtonsko obnašanje smo opisali s Potenčnim zakonom in Kvadratnim modelom, psevdoplastično nenewtonsko obnašanje pa s Potenčnim zakonom ter Carreau-Yasuda modelom. Za opis newtonskega visokznega obnašanja pa smo uporabili primerno vrednost indeksa toka Potenčnega zakona. Prikazana je primernost posameznih turbolentnih modelov, Launder-Sharma, Nagano-Hishida ter modificirani Nagano-Hishida, za modeliranje turbolentnega toka nenewtonske tekočine upoštevajoč vse dodatne izvorne člene, ki nastopajo v časovno povprečenih enačbah ohranitvenih zakonov.Type of material - dissertation ; adult, seriousPublication and manufacture - Maribor : [P. Ternik], 2005Language - slovenianCOBISS.SI-ID - 10134806
Author
Ternik, Primož
Other authors
Marn, Jure |
Hriberšek, Matjaž
Topics
fizika |
mehanika tekočin |
nenewtonske tekočine |
turbulentni tok |
dvoenačbni modeli |
numerično modeliranje |
metoda končnih prostornin |
doktorska disertacija
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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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Ternik, Primož | 20235 |
Marn, Jure | 08584 |
Hriberšek, Matjaž | 11167 |
Source: Personal bibliographies
and: SICRIS
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