Results of computer modeling of action of a pulsing gas stream effect on an aerodynamic drag resistance and process of heat exchange of a cylindrical wood are presented. Aim of work was caused by the necessity to research the reasons of experimentally established fact of magnification of intensity of process of drying of wood particles by a pulsing airflow of the defined frequency [Patent of the Republic of Latvia 2003]. In the work was established that in the considered range of Reynolds numbers 102 - 104 and frequencies of stream macropulsation 1 - 20 Hz can occur magnification, and diminution instantaneous values of drag coefficient and heat transfer coefficient. Average values of above mentioned coefficients are simultaneously increasing. Based on computer simulation, conditions at which the coefficients reach extreme values have been specified. Typical features of the flow, corresponding to these requirements are described.