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alan81 May 10, 2011 16:00

Particle-Laden Flow Tutorial
 
Dear all,


I have a question related to Particle-Laden Flow Tutorial. in this tutorial the star-ccm+ partially blocked elbow duct is used to simulate Particle-Laden Flow. i do not know how to find that in which way the duct geometry was created, i want to know if that duck is solid or has thickness.
because i am going to simulate in Particle-Laden Flow in pipe so do have to create a solid cylinder (one circle and extrude it) or as pipe has a thickness ( two circle subtract them and then extrude it ).

Thanks for your help

f-w May 10, 2011 17:55

That particular duct is a solid. Unless you are modeling heat transfer through the wall, then geometric wall thickness is not required.

alan81 May 11, 2011 03:25

Thanks f-w

in my case i want to model the erosion in pipe which liquid( oil) and sand are inside the pipe, do i have to create a solid geometry of pipe or creating a pipe with specific thickness??


kind regards,
alan

f-w May 11, 2011 11:45

Create a solid pipe (the wall of which will be representative of the inner wall).

alan81 May 11, 2011 11:48

Dear f-w

Thanks for your respond, one more thing, how can i chose the material for the pipe?? is that possible to choose the martial of the pipe??

many thanks

f-w May 11, 2011 16:46

I suggest you go through the "Modeling Erosion" tutorial, it should answer your questions.

Modeling Physics > Modeling Multiphase Flow > Using the Lagrangian Multiphase Model > Working with Lagrangian Phase Models > Modeling Erosion

alan81 May 11, 2011 18:00

Hi again,

thanks for your suggestion f-w. yes its written that the erosion depends on the type of the wall material. when you choose the model of erosion, there is a material particle in the model but still i can not find the material of the wall. and i am not sure if Bai-Gosman that is what i am looking for or not.

have a nice time

f-w May 11, 2011 19:18

The wall material is taken care of using coefficients specified by the user in the erosion models. More info in: Modeling Physics > Modeling Multiphase Flow > Using the Lagrangian Multiphase Model > Formulation > Erosion

I found a good tutorial for you to follow: Training Guide > Multi-Phase Flow Tutorials > Solid Particle Erosion Tutorial

alan81 May 13, 2011 04:15

Thanks f-w

I still can not find where i have to change the material of the pipe itself. Do you know where i should change it??


Thanks

rwryne May 17, 2011 09:37

Quote:

Originally Posted by alan81 (Post 307476)
Thanks f-w

I still can not find where i have to change the material of the pipe itself. Do you know where i should change it??


Thanks


Expand Continua->Expand your Solid continua->Expand Models->Expand solid. It defaults to Al, right click and hit replace with.

alan81 May 17, 2011 11:48

Thanks rwryne for your answer, now its clear that the al is chosen as a default martial for the the pipe.

thanks again

alan81 May 17, 2011 13:41

hi rwryne,

but according to the tutorial that is the properties of the solid particle which entrained in the liquid which is written in the tutorial ((Sand particles are entrained in the liquid flow in this simulation and so the density of the Lagrangian phase must be set to the density of sand-- In the Continua > Physics 1 > Models > Lagrangian Multiphase > Lagrangian Phases > Phase 1 node, open the Models > Solid > Al > Material Properties > Density node and select the Constant node.))

so if that is the properties of particle, where should we change the properties of the pipe( in the tutorial is duct)

best wishes

alan81 May 17, 2011 13:43

those information are written in solid particle particle erosion tutorial

rwryne May 17, 2011 14:45

Quote:

Originally Posted by alan81 (Post 308005)
hi rwryne,

but according to the tutorial that is the properties of the solid particle which entrained in the liquid which is written in the tutorial ((Sand particles are entrained in the liquid flow in this simulation and so the density of the Lagrangian phase must be set to the density of sand-- In the Continua > Physics 1 > Models > Lagrangian Multiphase > Lagrangian Phases > Phase 1 node, open the Models > Solid > Al > Material Properties > Density node and select the Constant node.))

so if that is the properties of particle, where should we change the properties of the pipe( in the tutorial is duct)

best wishes

I looked at this tutorial: you are not actually modelling the pipe in it (i.e. no mesh is being generated to represent the volume of the pipe, only of the surface). The pipe's material properties are being set on the wall boundaries within the fluid continua.

See this page in the help: Training Guide > Multi-Phase Flow Tutorials > Solid Particle Erosion Tutorial > Setting Lagrangian Phase Boundary Conditions > Setting the Erosion Model
specifically:
Quote:

When modelling erosion using CFD methods, it is necessary to select an erosion model based on a knowledge of the material undergoing erosion and the conditions under which the erosion is taking place.


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