Results in the form of fluctuating lift coefficients, surface pressure coefficients and phase angle, are presented for a square cylinder undergoing transverse oscillations over a range of frequencies and amplitudes.
In addition, spanwise length of computational domain is found to slightly influence the mean aerodynamic coefficients whereas it shows strong impacts on fluctuating aerodynamic coefficients, which motivates a development of grid-independent estimation method for quantitative evaluations of fluctuations.
This paper presents the results of such an analysis on fluctuating pressure coefficients on the Silsoe structures building.
The predicted power spectral densities for fluctuating aerodynamic coefficients are in good agreements with experiments in primary frequencies, which can be explained by the flow patterns.
The relative differences between the measurement and predicted results are 3.4% (mean drag coefficient), 11% (fluctuating drag coefficient), 25.6% (fluctuating side force coefficient) and 4.7% (Strouhal number).
Period I, when the cutting distance is less than half of the size of the abrasive particle, the friction coefficient fluctuates violently in certain range due to surface effect of the material; while in period II, all the friction coefficients fluctuate in very small range, and the friction coefficients remains steady state at different angles.
Finally, a method for estimating grid-independent fluctuating aerodynamic coefficients is proposed by using a systematic elongation of spanwise length and is validated by the numerical tests.
Moreover, for large gap ratio cases, the test model with cross beams also has higher fluctuating pressure coefficients on the leeward box which just decrease a little comparing with the test model without cross beams.
Both fluctuating frequency and dispersion coefficient of particles increased with decrease in surface tension of liquid phase, due to the increase of bubbling phenomena with decrease in σL.
The two values of fluctuating frequency and dispersion coefficient of particles increased with increase in particle size, but decreased with increase in liquid viscosity due to the restricted movement and motion of particles in the viscous liquid medium.
