About press control when using fix rigid

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1

Hi,

I would like to study a nanoparticle interacting with lipid membrane. I use the fix rigid/nve command to deal with the nanparticle composed of 660 point particles. The nanoparticle is above the membrane.

I want to use the fix press/berendsen to control the press of the system. I want to know it is reasonable not to rescale the position of nanoparticle?

It seems that " fix 40 all press/berendsen x 0.98665 0.98665 1000 y 0.98665 0.98665 1000 z 0.98665 0.98665 1000 couple xy modulus 16667 " and " fix 40 mem_water press/berendsen x 0.98665 0.98665 1000 y 0.98665 0.98665 1000 z 0.98665 0.98665 1000 couple xy modulus 16667 dilate partial" lead to different lx ly lz values.

2

Since the commands do different things (with and without dilate partial),
why shouldn't they give different results?

Steve