# Boundary Conditions for a Venturi in Gambit

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 December 11, 2009, 15:24 Boundary Conditions for a Venturi in Gambit #1 New Member   Join Date: Dec 2009 Posts: 2 Rep Power: 0 I need help assigning boundary conditions for a venturi I have 3-D modeled and meshed in Gambit. My known is the velocity at the inlet. I would like to find the pressure differential between the inlet and the throat and between the inlet and the outlet. How I modeled the venturi: -I modeled the venturi by inserting points in the following configuration *...... *....... *..... * ...........* ...* * ........................* -I then connected the points to form lines ______ .........._____ | ........\_____/...... | |_________________| -From here I used the "Wireframe" function to connect the lines to form 1 face. Then I revolved the face to get a single solid ........___P1__.............. __P3__ .......|........... \__P2__/........... | V -> |..................................... | .......|............. ______............| .......|_______/ ..........\______| I have the 1st vertical face assigned as the velocity inlet. I have the horizontals and diagonals assigned as walls. How do I assign the boundary conditions to get P1, P2, and P3 Thanks in advance!

 December 13, 2009, 18:18 #2 New Member   JT.Q Join Date: Dec 2009 Posts: 9 Rep Power: 7 venturi tube is used to obtain the velocity of flow. actually the velociy in normal direction to the axis at p is zero,so i think wall with velocity equal inlet velocity for p1&p3 is suitable,and the bc. at p2 is wall with velocity caculated by using continuity eq. u can also try symmetry BC. which is identical with moving wall mathematically but i have a question how you kown the inlet velocity of a venturi tube

 December 13, 2009, 18:37 #3 New Member   Join Date: Dec 2009 Posts: 2 Rep Power: 0 I am designing a venturi that will be used to measure the volumetric flow rate. The differential pressure will be monitored to insure the correct inlet velocity and volumetric flow rate. I've done the calculations, but now I want to simulate it and verify my work. I also want to look at the pressure regain from P2 to P3.

 December 15, 2009, 05:35 venturi #4 New Member   Kumar Join Date: Apr 2009 Posts: 2 Rep Power: 0 Hi I think its better to use cylinder and frustum for creating the venturi (top down approach), unless u are particular about the bottom up approach. To get the pressure differential, create isosurfaces and find the static pressure difference. Hope this helps

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