How to create hydrostatic pressure in the fluent

sirpolar · December 14, 2014, 10:59

Dear all

How can I create the hydrostatic pressure in the fluent?

for example imagine a pool is filled with water at the beginning(t =0) therefore the water must have hydrostatic pressure in the pool. then another fluid is entered to the bottom of pool under pressure via a pipe.
how can I create the hydrostatic pressure of water

thank you

LuckyTran · December 14, 2014, 17:40

enable gravity?

sirpolar · December 15, 2014, 09:41

yes lucktarn, I select the water as primary phase and enable the gravity. but hte hydrostatic pressure of water doesn't create!

macfly · December 15, 2014, 21:42

It's because when you enable gravity the pressure is redefined as in equation (7-54) here: https://www.sharcnet.ca/Software/Flu...et_hydrostatic

What you're plotting as static pressure is now

. If you want to visualize the hydrostatic head, you can quickly define a Custom Field Function that computes $p = p' + \rho g y$ , or just $\rho g y$ .

ghost82 · December 16, 2014, 16:05

I usually set operating density to 0 to get hydrostatic pressure (and enable gravity).

sirpolar · December 17, 2014, 11:49

can I write an UDF for hydrostatic pressure and apply it to the pressure outlet boundaries to create hydrostatic pressure?

LuckyTran · December 17, 2014, 12:37

I think the custom field function is easiest to implement.

sirpolar · December 21, 2014, 10:51

Dear Luckytran and ghost 82

If I want that at t=0 which there is only water (density =1000) in the whole domain with its hydrostatic pressure and after that another fluid with density 5 is about to enter the domain, I should set the operating density to zero as well ?

December 14, 2014, 10:59	How to create hydrostatic pressure in the fluent	#1
sirpolar Member Ebrahim Join Date: Feb 2014 Posts: 57 Rep Power: 12	Dear all How can I create the hydrostatic pressure in the fluent? for example imagine a pool is filled with water at the beginning(t =0) therefore the water must have hydrostatic pressure in the pool. then another fluid is entered to the bottom of pool under pressure via a pipe. how can I create the hydrostatic pressure of water thank you

December 16, 2014, 16:05		#5
ghost82 Senior Member Rick Join Date: Oct 2010 Posts: 1,016 Rep Power: 27	I usually set operating density to 0 to get hydrostatic pressure (and enable gravity). __________________ Google is your friend and the same for the search button!

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December 14, 2014, 17:40		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,764 Rep Power: 66	enable gravity?

December 15, 2014, 09:41		#3
sirpolar Member Ebrahim Join Date: Feb 2014 Posts: 57 Rep Power: 12	yes lucktarn, I select the water as primary phase and enable the gravity. but hte hydrostatic pressure of water doesn't create!

December 15, 2014, 21:42		#4
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	It's because when you enable gravity the pressure is redefined as in equation (7-54) here: https://www.sharcnet.ca/Software/Flu...et_hydrostatic What you're plotting as static pressure is now . If you want to visualize the hydrostatic head, you can quickly define a Custom Field Function that computes $p = p' + \rho g y$ , or just $\rho g y$ .

December 17, 2014, 11:49		#6
sirpolar Member Ebrahim Join Date: Feb 2014 Posts: 57 Rep Power: 12	can I write an UDF for hydrostatic pressure and apply it to the pressure outlet boundaries to create hydrostatic pressure?

December 17, 2014, 12:37		#7
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,764 Rep Power: 66	I think the custom field function is easiest to implement.

December 21, 2014, 10:51		#8
sirpolar Member Ebrahim Join Date: Feb 2014 Posts: 57 Rep Power: 12	Dear Luckytran and ghost 82 If I want that at t=0 which there is only water (density =1000) in the whole domain with its hydrostatic pressure and after that another fluid with density 5 is about to enter the domain, I should set the operating density to zero as well ?