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[½»Á÷] fix rigid ÒÔ¼°neigh_modify

Ìåϵ£ºÈíÁ´£¨chain£©+Ó²°ô£¨rod£©
group    rod   type 1  
group    chain type 2

¸üÐÂλÖÃʱʹÓÃÈçÏÂfix£º
fix               1 chain nve
fix               2 rod    rigid molecule

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For computational efficiency, you may wish to turn off pairwise and bond interactions within each rigid body, as
they no longer contribute to the motion. The neigh_modify exclude and delete_bonds commands are used to do
this.

ÌåϵÖеÄÓ²°ôûÓж¨Òå³É¼ü¹ØÏµ£¬Òò´Ë²»´æÔÚʹÓÃdelete_bondsÃüÁî¡£ÔÚ±£Ö¤ÆäËûËùÓÐÃüÁîºÍ²ÎÊýÒ»ÖµÄÇé¿öÏ£¬ÎÒʹÓÃÈçÏÂÁ½ÖÖneigh_modify×ö²âÊÔ£º
£¨1£©neigh_modify      delay 3 every 1
£¨2£©neigh_modify      delay 3 every 1 exclude molecule rod£¨ÌåϵÖаüº¬ºÜ¶à¸örod·Ö×Ó£©
°´ÕÕÊÖ²áÖеÄ˵·¨£¬ÉÏÊöÁ½ÖÖneigh_modifyÖ®¼äÖ»´æÔÚ¼ÆËãЧÂʵÄÎÊÌ⣬²»»á´øÀ´½á¹ûµÄ²îÒì¡£¿ÉÊÇÎÒ¸ú×ÙÁËÌåϵÖÐrodµÄ¾ù·½Î»ÒÆ£¬·¢ÏÖÁ½Õß²»Ò»Ö¡£
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