# Lagrangian Multiphase model

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 October 2, 2012, 22:20 Lagrangian Multiphase model #1 New Member   Join Date: Oct 2012 Posts: 4 Rep Power: 4 Hello All Does anyone here has an experience working in Lagrangian Multiphase model in STAR CCM+ 7.04.011?? If yes please can you reply to the post ASAP. Thank you for your time and help in Advance.

 October 3, 2012, 02:51 #2 Senior Member     siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 218 Rep Power: 9 Can you explain that what is the problem.

October 3, 2012, 13:30
#3
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Join Date: Oct 2012
Posts: 4
Rep Power: 4
Hey Saira817

Thanks for getting back.

I'm actually trying to model lagrangian multiphase model with mesh morphing.
Im working on bridge pier scouring ,two-phase sediment transport,using lagragian model along with mesh morphing.Here,im trying to entrain the sand particle from the bed using erosion rate field function as well as move the bed using some grid velocity.
But while running this i get this error in the attached file.

Regards
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 October 4, 2012, 03:40 #4 Senior Member     siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 218 Rep Power: 9 Do you mean that you have used erosion model to cause erosion of sediment? what is the particle phase in the water?

 October 4, 2012, 03:52 #5 New Member   Join Date: Oct 2012 Posts: 4 Rep Power: 4 Yes exactly,erosion model in Lagrangian phase which is solid particle with 0.00025 m of diameter and 2650 density.

 October 5, 2012, 04:14 #6 Senior Member     siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 218 Rep Power: 9 Actually, I do not know what is wrong in this case. But, in erosion, erosion happens on a surface by some particles. What is surface material and what is particle material?

 October 8, 2012, 16:57 #7 New Member   Join Date: Oct 2012 Posts: 4 Rep Power: 4 Well ,my bed surface is a sand sediment,and particles are sand. I defined the bed surface as wall, in order to calculate the wall shear stress.

 June 4, 2015, 07:13 #8 New Member   Ayush Jain Join Date: Nov 2014 Posts: 14 Rep Power: 2 Hi niuprats, I have a doubt that erosion is actually a long time process, so if you want to model changing the geometry using morphing, how will you decide your physical time and time step.

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