FLUENT运用疑难问题及解答方案

gallongallon

1………………………………
描述“memory limit on 32 bit machines ”
问题：
One of my clients hit the 2GB limit of RAM being used on a 32 bit machine.
Is this limit per processor? That is, can running parallel on 2CPU';s give access to the total of 4GB which is actually available on the machine?
解答：
It is per process; so running -t2 parallel will use all 4Gbytes on Unix/Linux.
The same for Windows.
Windows 32 bit allows up to 4GB. By default, each process can use up to 2GB. So if you have two processes running, you can use almost 2GB for each of them (the operating system will consume some memory). More than 4GB of RAM makes no sense because the operating system cannot manage more than that.
Adding the flag /3GB in the boot.ini file will allow Windows XP (not Win2k) to use 3GB per process but still the overall limit is 4GB. Furthermore, processes that use more than 2GB may not run properly.

gallongallon

基本都是会碰到的一些疑难问题，解答同时给出
欢迎翻译成中文，关键是我没有时间
每页一个问题及解答，希望对大家有帮助。

yicannan310

哈哈，英文也可以的，多花点时间看看就可以了～～
感谢gallongallon大侠～

gonglv

没有了？

gallongallon

2………………………………
描述“Boolean operations with Adaption Registers  ”
问题：
User';s Guide contains the description of the operations which can be used through Adapt>Manage panel.
However, the names of these operations ("Mask" "Combine" "Invert" "Exchange") are not self-explanatory and
sometimes confusing for math-oriented users; very often, users ask what is the combination of operations
which have to be done to achieve a certain boolean operation like "Intersection", "Union", "Subtraction",
"Complementary" of sets.
解答：
The following table shows which operations from Adapt>Manage are to be used
in order to perform a certain boolean operation with adaption registers A and B.
Boolean Operation >>>>>>>>>>> Equivalent Actions in Adapt>Manage
________________________________________________________
CEA = E - A (complement of A wrt E) >>>>>>> Change Type on A (to mask), then Invert A
___________________________________________________________
A È B (A unite with B) >>>>>>>>>>> Combine A and B
_________________________________________________________________
A Ç B (A intersect with B) >>>>>>>>> Change Type on B (to mask), then Combine A and B
__________________________________________________________________________
A - B (A minus B) >>>>>>>> Change Type on B (to mask), then Invert B, then Combine A and B