Nalazite se na CroRIS probnoj okolini. Ovdje evidentirani podaci neće biti pohranjeni u Informacijskom sustavu znanosti RH. Ako je ovo greška, CroRIS produkcijskoj okolini moguće je pristupi putem poveznice www.croris.hr
izvor podataka: crosbi !

ANALYSIS AND IMPLEMENTATION OF THE HARMONIC BALANCE METHOD IN COMPUTATIONAL FLUID DYNAMICS (CROSBI ID 402438)

Ocjenski rad | diplomski rad

Cvijetić, Gregor ANALYSIS AND IMPLEMENTATION OF THE HARMONIC BALANCE METHOD IN COMPUTATIONAL FLUID DYNAMICS / Jasak, Hrvoje (mentor); Zagreb, Fakultet strojarstva i brodogradnje, . 2015

Podaci o odgovornosti

Cvijetić, Gregor

Jasak, Hrvoje

engleski

ANALYSIS AND IMPLEMENTATION OF THE HARMONIC BALANCE METHOD IN COMPUTATIONAL FLUID DYNAMICS

In this thesis the Harmonic Balance Method for non-linear periodic flows is presented. Assumption of a time-periodic flow allows us to formulate 2n + 1 coupled steady state problems. By solving 2n+1 steady state problems, a transient flow field is obtained. Fourier series expansion is the core of the Harmonic Balance Method, therefore the accuracy of the method depends on the number of harmonics specified, n. Accuracy of the method also depends on the periodic nature of the problem. The method was first derived for a passive scalar transport and implemented in OpenFOAM. Validation has been carried out on 4 test cases concerning forced periodic behaviour at the inlet of the rectangular 2D domain. The first test case was a sine wave, which was fully resolved with 1 harmonic. The second case was a linear combination of sine and cosine waves with different frequencies, resolved with 2 harmonics. After successful validation of harmonic waves, robustness and accuracy test was carried out on two square waves. Square waves are numerically more difficult and more demanding, which was also shown in the convergence study carried out using 3, 5, 7 and 10 harmonics. Harmonic Balance Method results were compared to transient simulation for all of the test cases. After validation of the passive scalar transport, pressure-velocity system for the Harmonic Balance Method was derived and implemented. Validation of NACA2412 pitching airfoil was presented together with performance comparison of transient solver and harmonic balance.

Harmonic Balance; CFD; OpenFOAM; Fourier series; harmonic; periodic; nonlinear; NACA; airfoil pitching

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

Podaci o izdanju

90

17.07.2015.

obranjeno

Podaci o ustanovi koja je dodijelila akademski stupanj

Fakultet strojarstva i brodogradnje

Zagreb

Povezanost rada

Strojarstvo