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08-11-2009 06:49 AM

Hi,

i want to apply a hydrostatic pressure in a tank volume meshed in shell elements.

i did pick the mesh on the volum of the tank and applied the hydrosttaic pressure

from UGI, but i am bit confused about the vector direction.

does the vector direction control the depth of the tank? does it need to be default

(-Z)?

when i change the vector from -Z into -X the value of the pressure per unit area

change in PLOAD4 card.

Many thanks,

3 REPLIES

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08-11-2009 08:57 AM

"engrequest"

>

>Hi,

>

> i want to apply a hydrostatic pressure in a tank volume meshed in shell elements.

>i did pick the mesh on the volum of the tank and applied the hydrosttaic pressure

>from UGI, but i am bit confused about the vector direction.

>does the vector direction control the depth of the tank? does it need to be

>default

>(-Z)?

>when i change the vector from -Z into -X the value of the pressure per unit

>area

>change in PLOAD4 card.

>

>Many thanks,

>

>

From the NX Help for the Liquid Surface block of the Hydrostatic Pressure dialog

box:

Specify Vector: Defines the direction downward from

the surface of the liquid. The default

direction is –Z.

Specify Point: Specifies the location of the surface

of the liquid. The default location

is (0,0,0).

In other words, you're simply defining a plane representing the fluid surface by

specifying a point and normal vector. The vector points "down" into the fluid.

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08-11-2009 09:58 AM

Thanks Jim,

i am just wondering whether the hydrostatic pressure is the right option to model

a fluid (water) pressure inside a reservoir volume.

i need to apply a pressure into the shell elements on the reservoir surfaces.

Many Thanks,

"Jim Bernard"

>

>"engrequest"

>>

>>Hi,

>>

>> i want to apply a hydrostatic pressure in a tank volume meshed in shell

>elements.

>>i did pick the mesh on the volum of the tank and applied the hydrosttaic

>pressure

>>from UGI, but i am bit confused about the vector direction.

>>does the vector direction control the depth of the tank? does it need to

>be

>>default

>>(-Z)?

>>when i change the vector from -Z into -X the value of the pressure per unit

>>area

>>change in PLOAD4 card.

>>

>>Many thanks,

>>

>>

>

>From the NX Help for the Liquid Surface block of the Hydrostatic Pressure

>dialog

>box:

>

> Specify Vector: Defines the direction downward from

> the surface of the liquid. The default

> direction is –Z.

>

> Specify Point: Specifies the location of the surface

> of the liquid. The default location

> is (0,0,0).

>

>In other words, you're simply defining a plane representing the fluid surface

>by

>specifying a point and normal vector. The vector points "down" into the fluid.

>

>

>

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08-11-2009 10:21 AM

>

>Thanks Jim,

>

>i am just wondering whether the hydrostatic pressure is the right option to

>model

>a fluid (water) pressure inside a reservoir volume.

>i need to apply a pressure into the shell elements on the reservoir surfaces.

>

>Many Thanks,

>

>"Jim Bernard"

>>

>>"engrequest"

>>>

>>>Hi,

>>>

>>> i want to apply a hydrostatic pressure in a tank volume meshed in shell

>>elements.

>>>i did pick the mesh on the volum of the tank and applied the hydrosttaic

>>pressure

>>>from UGI, but i am bit confused about the vector direction.

>>>does the vector direction control the depth of the tank? does it need to

>>be

>>>default

>>>(-Z)?

>>>when i change the vector from -Z into -X the value of the pressure per unit

>>>area

>>>change in PLOAD4 card.

>>>

>>>Many thanks,

>>>

>>>

>>

>>From the NX Help for the Liquid Surface block of the Hydrostatic Pressure

>>dialog

>>box:

>>

>> Specify Vector: Defines the direction downward from

>> the surface of the liquid. The default

>> direction is –Z.

>>

>> Specify Point: Specifies the location of the surface

>> of the liquid. The default location

>> is (0,0,0).

>>

>>In other words, you're simply defining a plane representing the fluid surface

>>by

>>specifying a point and normal vector. The vector points "down" into the fluid.

>>

>>

>>

>

If you want the pressure to vary with the fluid depth, then hydrostatic pressure

is what you need.

Regards,

Jim

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