Lagrangian bubble column

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 November 24, 2017, 12:13 Lagrangian bubble column #1 New Member   wafaa hana Join Date: Nov 2017 Location: Montreal Posts: 4 Rep Power: 2 Hello! Im trying to do a particle user fortran routine to calculate the added mass coefficient and to do so , I need to find the distance between the particles and the acceleration of each particle. If you guys can help me with this, it would be much appreciated ! Thank you

 November 25, 2017, 06:36 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,195 Rep Power: 109 Is this a eularian or lagrangian particle tracking model? The distance would be calculated the same regardless of the model - you can work back from the volume fraction and particle size how many particles per unit volume and therefore their average distance apart. Important note - in lagrangian particle tracking models the tracked particles are representative of a population of particles. In other words, there are more particles than is modelled in the particle tracks. Acceleration is a bit more tricky. I guess if this is lagrangian you can double differentiate the particle position to get the acceleration. I would need to do some thinking to determine this for Eularian models.

 November 25, 2017, 10:37 #3 New Member   wafaa hana Join Date: Nov 2017 Location: Montreal Posts: 4 Rep Power: 2 It's for a lagrangian model

 November 26, 2017, 18:36 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,195 Rep Power: 109 OK, thanks. Do my suggestions help?

 November 29, 2017, 14:06 #5 New Member   wafaa hana Join Date: Nov 2017 Location: Montreal Posts: 4 Rep Power: 2 The thing is , my professor asked me to isolate 3 air bubbles (in air bubble column) and use the equations to calculate the added mass force that require the distance between the bubble 1 and 2 , the bubble 1 and 3 and also the acceleration of each of those bubbles. I'm not familiar with fortran user routine. If you guide me, that would be appreciated.

 November 29, 2017, 17:48 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,195 Rep Power: 109 The CFX documentation has several examples of user fortran. There are more on the ANSYS Customer website.

 Tags lagrangian, particle, routine, user fortran

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