流体边界层的分子动力学模拟.pdfVIP

A b st ra c t P erp en d icu lar to th e ex tern a l d r iv in g for ce ; th e av era g e d v e lo c ity in ere a se s w ith th e d r iv e n o n lin early a n d th e p o w er一law sc a lin g re la tio n sh iP c o u ld n o t b e d er iv e d . h i a d d itio n ，w e find that the critical force Fc in creases w ith the stren gth of th e p inn in g，an d su dden in crease 15 found in 凡 w ith in th e eroSSov er from th e sm eetie to P lastic flow s. M ore th an th at，w e f in d th at th e av er ag e d stren g th o f th e B ra g g p ea k s d e erea se s w ith in erea sin g th e stren g th o f th e P inn in g an d su d d en d e ere a se s are o b serv e d w ith in th e ero sso v er fro m e la stie e仃 sta l to sm e etie f lo w s an d w ith in th e ero sso v er fro m sm ee tie to p la stic f lo w s. F inall又 u sin g L an gev in m oleeu lar dyn am ies，w e inv estigate system atieally th e sliP d yn am ie s o f f lu id m o n o lay er o n th e su rfac e o f P eri o d ic P i俪 n g b o u n d a r y. W e f in d a P la stic flo w ab o v e th e d eP in in g for a w eak P inn in g ，an d w ith an in erea se in 伍 e stren gth o f the P inLn in g ，a cro sso v er fro m e la stic to sm e etie f lo w s a s w e ll a s a cr o sso v er fro m sm e etie to P la stie cry sta l f lo w s 15 fou n d . Th is 15 qu ite sam e a s th at o f d iso r dered b o u n d ar y. T h e ob tain ed resu lts are h elP ful for studyin g th e sliP of flu ids on th e surfac e of b o u n d ar y a s w e ll a s re sea r ch o f turbu len c e . K ey w o r d s :L an g ev in m o leeu lar d ” am ic s d ” am ic p h a se tran sitio n slip