How to define the rheology of fluid in material library
Hi experts
I am using HyperWorks CFD 2022.1 to simulate debris flow simulation using granular multiphase flow option in the material library. I Have a few issues in creating the model. I have discretized my problem as dispersed material(particles o size 3.5 mm) with fluid moving in a channel with a dam break condition. There are few doubts about defining the material properties exactly with my material.
1. Is it possible to simulate the sediment transport along with fluid by following the dam break step?
2. How to define the fluid having strain rate and viscosity as my fluid is Bingham type but I only have strain vs viscosity and yield stress. How to define other parameters like Bingham viscosity, time-indexed, and stress growth rate as I don't have these properties?
3. As a mixture has different solid concentrations and rheology, How can I define the solid content using the granular multiphase option?
4. As flow is dam-break type how to assign the defined sediment mixture to a predefined cubical box like air-water mutipase simulation. Option is not showing defined sediment-water mixture for the defined box.
Answers
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Noticed this is essentially a duplicate of other post - but with more questions.
1. Possibly - start with a review of the tutorial ACU-T: 4102 Fluidized Bed using the Granular Multiphase Model
https://2022.help.altair.com/2022.1/hwcfdsolvers/acusolve/topics/tutorials/acu/acu_4102_intro_cfd_r.htm#acu_4102_intro_cfd_r2. Is this Bingham fluid the properties of the mixture (carrier fluid plus particulates) or just the carrier fluid? With the granular multiphase approach, you need the fluid properties of the carrier fluid on its own.
3/4. As in the tutorial the volume fraction of the granular phase (the particulate) is defined with initial conditions - and the volume fraction is tracked.
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Carrier fluid is Bingham fluid but in the material library, it is asking for 5 to 6 parameters to define it. From where i can get the documentation of material definition so I understand the term used in material library. Further how solid particle is defined with granular flow still unclear
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Mudassir khan said:
Carrier fluid is Bingham fluid but in the material library, it is asking for 5 to 6 parameters to define it. From where i can get the documentation of material definition so I understand the term used in material library. Further how solid particle is defined with granular flow still unclear
Here is the Viscosity Model page from the Command Reference Manual - where the parameters and equations are described.
This page describes the various parameters for the particles as in the granular flow tutorials - when using granular flow and eulerian-eulerian.
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Altair Employee