Simulate a iron hopper

micpage18 · January 29, 2007, 13:18

Hi,

I want to simulate a iron hopper.

The hopper is like a silo with a cone shape full of iron ball (2 cm of diameter). The silo is emptied by gravity.

I want to know what is the "flow rate" of iron ball.

Is Openfoam can simulate a case like this?

Thank you

Michael Page

alberto · January 29, 2007, 18:38

Hoppers discharge of fine powders (up to 1mm; yours are not exactly "particles" :-)) is commonly simulated using a two-fluid model. The properties of the granular phase can be described:

a) using the kinetic theory of granular flow, together with a frictional stress model (see Schaeffer, Johnson and Jackson, Srivastava and Sundaresan), which is essential to properly capture the flow field properties in the densest zones.

This approach was applied in a recent paper from Srivastava A., Sundaresan, S., Analysis of a frictional–kinetic model for gas–particle flow, Powder Technology 129 (2003) 72– 85, using MFIX ( www.mfix.org ).

b) using a specific rheological model.

OpenFOAM currently implements the kinetic theory of granular flow in twoPhaseEulerFoam and some frictional models. Unfortunately the solution of dense flows like those in hoppers is still not fully stable and some more work is necessary (and welcome ;-)).
The same solver implements a simple rheological model (see Gidaspow and others authors, look for "normal stress modulus"), which is more stable.

c) A more computationally expensive method is based on Discrete Element Simulations. But I don't have much experience with it.

For the first two approaches, I've some doubt due to the size of the spheres.

How big is your system?

Regards,
Alberto

virajb · August 28, 2017, 21:48

Hello Dr. Alberto,

I am trying to simulate a test case almost exactly similar to what Michael tried to do. I am simulating granular flow in a silo with particle diameter 1mm and gravity discharge.

I want to use the Schaeffer and the S&S model separately for this purpose.

I wanted to confirm whether the simulation of such flow is still not fully stable in OpenFOAM?

Thank you!

Best Regards
Viraj

January 29, 2007, 13:18	Hi, I want to simulate a i	#1
micpage18 Member Michael Page Join Date: Mar 2009 Location: Quebec, Canada Posts: 36 Rep Power: 17	Hi, I want to simulate a iron hopper. The hopper is like a silo with a cone shape full of iron ball (2 cm of diameter). The silo is emptied by gravity. I want to know what is the "flow rate" of iron ball. Is Openfoam can simulate a case like this? Thank you Michael Page __________________ Michael Page michael.page@simu-k.com Simu-K inc. www.simu-k.com

January 29, 2007, 18:38	Hoppers discharge of fine powd	#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Hoppers discharge of fine powders (up to 1mm; yours are not exactly "particles" :-)) is commonly simulated using a two-fluid model. The properties of the granular phase can be described: a) using the kinetic theory of granular flow, together with a frictional stress model (see Schaeffer, Johnson and Jackson, Srivastava and Sundaresan), which is essential to properly capture the flow field properties in the densest zones. This approach was applied in a recent paper from Srivastava A., Sundaresan, S., Analysis of a frictional–kinetic model for gas–particle flow, Powder Technology 129 (2003) 72– 85, using MFIX ( www.mfix.org ). b) using a specific rheological model. OpenFOAM currently implements the kinetic theory of granular flow in twoPhaseEulerFoam and some frictional models. Unfortunately the solution of dense flows like those in hoppers is still not fully stable and some more work is necessary (and welcome ;-)). The same solver implements a simple rheological model (see Gidaspow and others authors, look for "normal stress modulus"), which is more stable. c) A more computationally expensive method is based on Discrete Element Simulations. But I don't have much experience with it. For the first two approaches, I've some doubt due to the size of the spheres. How big is your system? Regards, Alberto BlnPhoenixKA likes this. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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August 28, 2017, 21:48		#3
virajb New Member Viraj Belekar Join Date: Aug 2017 Posts: 1 Rep Power: 0	Hello Dr. Alberto, I am trying to simulate a test case almost exactly similar to what Michael tried to do. I am simulating granular flow in a silo with particle diameter 1mm and gravity discharge. I want to use the Schaeffer and the S&S model separately for this purpose. I wanted to confirm whether the simulation of such flow is still not fully stable in OpenFOAM? Thank you! Best Regards Viraj