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Old   September 21, 2002, 07:15
Default water jet
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max
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I want to simulate a high-velocity free water jet in the air and to find the track of the water.The air was supposed to static,and gravity was considered.Could anyone give me some advice on how to specify the B.C. Thanks in anvance!

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?wall?pres outlet?
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Old   September 21, 2002, 15:17
Default Re: water jet
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sri
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Hi,

The following procedure might help you :

1)Let us take the domain shape a rectangle.

2)Make a small opening at the left edge,this can be acomplished by splitting the whole edge in Gambit.

3)Velocity inlet bc is given to this.

4)The right edge is given wall bc.

5)Fix the values of velocities of fluid zone(air) through

define--->boundary conditions--->fluid/fix values.

6)Multiphase model should be used.

hope this helps you!

You can model a moving jet using MDM feature,if interested.

Regards, sri
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Old   September 21, 2002, 22:47
Default Re: water jet
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max
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Hi,sri Thanks for your help. And my question is what kind of B.C should be applied to the bottom.(wall? pres out?).

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Old   September 22, 2002, 03:00
Default Re: water jet
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sri
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wall,

regards, sri
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Old   September 22, 2002, 04:42
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max
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thanks! The question is just like a high-velocity water enter a wall-bounded room?
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Old   September 24, 2002, 22:55
Default Re: water jet
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max
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I applied the B.C. as discussed above,however,it seemed difficult to converge.
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Old   September 26, 2002, 01:57
Default Re: water jet
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Alamgir
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r u running k-e model? if so then just have a look to under relaxation factor, u should run with low urf, make it half, then iterate.

Alamgir
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Old   September 27, 2002, 21:19
Default Re: water jet
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max
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Thanks,Alamgir! Do u think it was a static problem or a transient one?
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Old   October 7, 2002, 10:45
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shin
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are you using a multiphase flow model to solve your problem?if so, which model are you using,VOF or Mixture?i also want to know how do you handle the B.C. because i am trying to solve a similar question:a high tempreture and pressure gas jet ejecting from a Laval nozzle under water.i hope your responses.thanks in advance.
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Old   October 8, 2002, 04:14
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max
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Hi, shin The VOF scheme was used and wall B.C. was applied at the outer surface, however, it was difficult to converge. What about your question? I had simulated a steam-jet ejector, something like a Laval nozzle with a second throat. However, it was compressible and wall bounded. I had a foolish question: If I applied the Boundary conditions described above, that is, a high-velocity water jetting in a wall-bounded space, and no outlet B.C was applied, will the water become more and more in the space?
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Old   October 8, 2002, 06:50
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Alamgir
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Static or transient, both needs low urf to converge, otherwise continuity (residual) will touch the top.

bye

Alamgir
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Old   October 13, 2002, 11:32
Default Re: water jet
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shin
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hi,max.i have a same feeling as your,the iteration is difficult to converge.by the way,i want to ask you a question,namely did you solve the problem of the steam-jet ejector,and which fluid the jet was ejected in.my problem is not same as your:the external water flow is infinite, but i think the wall B.C. is right.
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Old   October 16, 2002, 21:19
Default Re: water jet
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max
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Hi,shin super-heated steam was used in my previous case.and now i am simulating a high-velocity water jettting in infintite atmosphere,can you give me some advice?
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