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How to use inches of water in CFX post?

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Old   September 23, 2007, 21:21
Default How to use inches of water in CFX post?
  #1
todd z
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I couldn't find this pressure unit in CFX, is there a way to use CFX-POST to show the pressure in inches of water.

Thanks, Todd!
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Old   September 24, 2007, 08:55
Default Re: How to use inches of water in CFX post?
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opaque
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Dear todd z,

If you are referring to "inches of water" as a unit, try inWg. For example,

Relative Pressure = 10 [inWg]

or inches of Mercury

Reference Pressure = 760 [mmHg]

or

Pressure = 11 [inHg]

all of them should work throughtout the ANSYS CFX product, i.e CFX-Pre/Solver/Post.

In CFX-Post, select Edit/Options/Common/Units/Custom and modify Pressure to be inWg, or inHg or mmHg.

Hope it helps, Opaque
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Old   September 24, 2007, 10:51
Default Re: How to use inches of water in CFX post?
  #3
BB
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Most of the time, the calculated pressure is not in unit of [inWg]. I usually do a convertion by P/1000 [kg/m^3]/25.4 [mm/in].

Any better way?
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Old   September 25, 2007, 11:22
Default Re: How to use inches of water in CFX post?
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CycLone
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Inches of water is expressed as [in water]

-CycLone
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Old   September 25, 2007, 12:25
Default Re: How to use inches of water in CFX post?
  #5
opaque
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Dear Cyclone,

I am sorry, but the valid syntax (within ANSYS CFX) for the units within the brackets does not include "in water", but "inWg".

You can see all the possible units available within the ANSYS CFX product under your installation directory in the file /etc/units.cfx

Opaque

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Old   September 25, 2007, 12:39
Default Re: How to use inches of water in CFX post?
  #6
CycLone
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Hi Opaque,

Trust me, it works. 'water' is in fact listed as a unit. 'in water' translates to pressure in inches of water. 'm water' would do the same for meters of water, etc. I've had problems with 'inWg' before that using 'in water' fixed.

-CycLone
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Old   September 25, 2007, 14:02
Default Re: How to use inches of water in CFX post?
  #7
opaque
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Dear Cyclone,

That is an obscure behavior to me, but it works. Same as:

a - 1 [in mercury]

b - 2 [in Hg]

c - 3 [inHg]

d - 4 [in water]

e - 5 [in Wg]

f - 6 [inWg]

Notice that [inwater], or [inmercury] do not work.

Looking into the units.cfx file, I found the water(Wg) and mercury(Hg) entries and how they convert to [Pa m^-1].

Thanks,

Opaque

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Old   October 10, 2007, 09:17
Default Re: How to use inches of water in CFX post? *NM*
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neilash kumar
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