LAMINAR FLOW PAST A CIRCULAR CYLINDER UNDER THE EFFECT 
OF NONSTATIONARY JET EFFLUX TO THE NEAR-WAKE REGION

V. L. Zhdanov,a S. A. Isaev, b 
and T. A. Baranovab 

UDC 532.526.5

Changes in a laminar flow past a circular cylinder under 
the effect of jets blowing out to its rare region have been studied 
numerically. Jet efflux was caused by a return flow of a part of the 
incoming flow in the inner channels of the cylinder due to the pressure 
difference between its front and end stagnation points. The channels 
connected the inlet window formed in the zone of the front stagnation 
point with two outlet windows on the backside surface of the cylinder. 
The influence of the coordinates of the jets issuing through the outlet 
windows and dimensions of the inlet and outlet windows on variation 
of the drag and lift coefficient and distribution of the coefficients 
of pressure and friction on the cylinder surface has been considered. 
It is shown that under the effect of blowing out the cylinder drag 
decreased by 4% and the amplitude of buoyancy force oscillations decreased 
by 40%.

a A. V. Luikov Heat and Mass 
Transfer Institute, National Academy of Sciences of Belarus, 15 P. 
Brovka Str., Minsk, 220072, Belarus; email: zhdanov@ns1.hmti.ac.by; 
b Academy of Civil Aviation, St. Petersburg, 
Russia. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 77, No. 
5, pp. 125-133, September-October, 2004. Original article 
submitted December 23, 2003.