model 3D coutee flow

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#1

Hi,

I am trying to model a 3D annular rotating flow.

I am able to give let make annular walls and let them rotating by giving initial velocity and set force =0 on the wall.

My question is about the temperature. I only want the set the temperature in the regions close to the walls. The temperature calculation should exclude the velocity components due the rotation.

I wanted to

compute IDro group-ID1 temp/rotate

compute IDre group-ID1 temp/region region-ID1
#2

You can make an annular region by intersecting two regions, via
the region intersect command.

However, you cannot a fix twice for the same parameter. The
second setting will override the first.

There is no current way to apply two biases to a temperature,
e.g. rotate and region in your case.

Steve

#3

Steve,

Thanks.

So the intersect command should look like this, right?

region ID interset 2 small-region out large-region

thanks,
Shihai

#4

Sorry, you need to try it yourself and examine the output,
e.g. dump the atoms in the resulting region and
visualize them. Posting to the mail list
for reassurance is not a substitute for figuring
out yourself what your script is doing.

Steve