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High frequency quasi-periodic oscillations (HF QPOs) are observed in theX-ray power-density spectra (PDS) of several microquasars and low mass X-raybinaries. Many proposed QPO models are based on oscillations of accretiontoroidal fluid structures orbiting in the vicinity of a compact object. Westudy oscillating accretion tori orbiting in the vicinity of a Kerr black hole.We demonstrate that significant variation of the observed flux can be caused bythe combination of radial and vertical oscillation modes of a slender,polytropic, perfect fluid, non-self-graviting torus with constant specificangular momentum. We investigate two combinations of the oscillating modescorresponding to the direct resonance QPO model and the modified relativisticprecession QPO model.

Simulations of flux variability of oscillating accretion fluid tori around Kerr black holes