A numerical study was performed for incompressible oscillating flow in a two2dimen2<br />sional channel

the so2called Womer sley flow

using lat tice2Bolt-mann met hod (LBM) . The pres2<br />sure gradient varies periodically. The major result s are as follows. When t he cycle is short

annu2<br />lar effect s exist in t he velocity profiles. The amplit udes of the velocity along t he centerline are<br />less t han t hose near t he wall

and the gradient s of t he velocity near t he wall are larger t han t ho se<br />in t he center region. However

when t he cycle is long t he velocity profiles are of parabolic type

<br />and the amplit udes of velocity along t he centerline are larger t han t hose near t he wall . The result s<br />of the velocity fields agree well wit h the analytical solution. The p hase difference between t he ve2<br />locity and temperat ure

t he profiles of t he temperat ure

and t he fluct uating characteristics of t he<br />temperat ure mainly depend o