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Old   November 24, 2017, 12:13
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wafaa hana
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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
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Old   November 25, 2017, 06:36
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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.
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Old   November 25, 2017, 10:37
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It's for a lagrangian model
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Old   November 26, 2017, 18:36
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OK, thanks. Do my suggestions help?
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Old   November 29, 2017, 14:06
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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.
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Old   November 29, 2017, 17:48
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The CFX documentation has several examples of user fortran. There are more on the ANSYS Customer website.
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