流体懇話会の講演会を下記のように開催いたします．どうぞご参加下さい。
「Dynamics and acoustics of hot jets」
Prof. Patrick HUERRE
平成20年10月31日(金) 16:30〜18:00
電気通信大学 東4号館 8階 AV会議室
Hot jets are known to undergo a transition from convective to absoluteinstability as the temperature ratio between the jet and the ambientmedium exceeds a critical value. DNS indicate that such a transitiongives rise to intrinsic self-sustained oscillations which may beregarded as a nonlinear global mode beating at a well defined frequency.Furthermore, the frequency may be predicted by applying the selectioncriterion of Couairon & Chomaz. The sound radiated by this global modewill be shown to be dipolar and to result from the acceleration ofenthalpy inhomogeneities.