Fluidized Bed-Eulerian Granular

[@jokhioization]

I want to simulate the suspended biomass pellets inside this furnace at centre , and the analyze the combustion ,heat transfer , can you guide how it will be done

[@Halimah_tazkia]

Hello sir. I have a question, can I simulate the depth of local scouring due to pillars in rivers with Ansys Fluent?

[@engr.abdullah2475]

Is it possible to couple multiphase and Multicomponent in Ansys Fluent ?

[@NazmulHossain-nb4lc]

I believe multicomponent means more than one gas/liquid phases. Yes it is very easily doable when they are immiscible. However if you are interested in mixtures with chemical reaction, it is also doable but I haven't done that in Fluent before

[@engr.abdullah2475]

I am trying to simulate Multiphase with species transport model to research agglomeration mitigation in Fluidized Bed Reactor... Can you tell it is feasible to form agglomeration in ANSYS FLUENT and study the respective parameters.

[@NazmulHossain-nb4lc]

Fluent solver is using Eulerian approach primarily. Although the DPM model seems like a Lagrangian model, the forces are not solved for individual particles. Its more like an averaging technique similar to Eulerian (Control Volume) method. So, my answer is No, you can't evaluate agglomeration based on cohesive forces acting on particles. However, you can still track positions of particles, which gives you general idea of the agglomeration. If you are really interested in agglomeration, try the CFD-DEM model which is a Eulerian-Lagrangian coupled approach

[@anujkuruwa8483]

I am trying to simulate fluidization of nanopartoicle agglomerates. I want to use a lagrangian fluidised bed i.e. DDPM is solids for my research needs in ANSYS 19.2 or even latest versions. However in DDPM, it only allows me tracking for injection. I want to place a bed of particles like this video and them track the particles of the bed. How should I define the discrete phase? Also is it possible to define properties such as cohesion, drag coefficients and solid structure (I have porous solids) for the particles in ANSYS?

[@NazmulHossain-nb4lc]

The DDPM model is for particle transport. So the particle density, fluid density and bc has to be for that particle transport scenario. Particles are considered as inert particles. On the other hand Eulerian-Granular model like in this video deals with the particles and fluid coupling via volume fractions. However particle cannot be tracked because the particle phase is solved with continuum approach as well. In summary, fluent cannot do Lagrangian model for fluidized bed where particles aren’t transported out of the domain. For that u need Cfd-dem software like MFIX, Rocky-Fluent coupling or others. I have made some videos on MFIX if u r interested. Rocky requires license to be bought.

[@aminkhaliq6682]

Hi, can blood be modelled as a mixture of RBCs, WBCs, and plasma.....please share your insight

[@NazmulHossain-nb4lc]

My answer is yes its doable but too much hassle in ANSYS. I would rater use some other tool which are more suitable To answer your question, if you use Dpm model in fluent, the particles(blood cells) are considered inert and only good for transport type flow. if you use Eulerian granular where particles are measured with specified density, the major assumptions (drag & collision(KTGF) models) might give too much error because of the purely continuum approach. if you want to do CFD-DEM(Eulerian-Lagrangian), ANSYS doesn't have it. You have to buy license for Rocky software which can be coupled with fluent. Or use other CFD-DEM software available.

[@kieyonero4165]

Thank you for the great tutorial sir! I just want to ask how to insert chemical reaction in fluidized bed? I tried turning on the species transport (with volumetric rxn) and typed in my activation energy and preexponential factor, but no rxn happened after the calculation. I also tried to use the particle surface reaction but still no reaction happened. What could be my mistake? My reaction is CuO (s) + SO2 (g) + 0.5 O2 (g) ---> CuSO4 (s) Inlet gas composition: SO2, O2, N2 Catalyst: CuO/gamma-Al2O3 Hoping for your reply. Thank you so much!

[@NazmulHossain-nb4lc]

Hi Kieyo, sorry for the delayed reply. This tutorial doesn't have any chemical reaction guidelines and I don't have any tutorials explaining that. Maybe I will make one in future. Please, see the video in the following link which I found very informative in doing chemical reaction problem. kzbin.info/www/bejne/Z5XNnHSmdqd2mqc

[@smtcfdsimulations8126]

Can the bottom inlet be nitrogen instead of air? In that case would it be three phases ( solid, air, nitrogen)?

[@NazmulHossain-nb4lc]

It would still be 2 phase flow, because air and nitrogen both are gas phase. However, u need to add nitrogen as phase 3 in the model. If u want to do 3 phase flow, u just need to add water/other fluid as phase 3 or phase 4….in this model

[@Our_traveldairies]

Hello, can i know the references of this boundary conditions and provide me the reference paper.

[@NazmulHossain-nb4lc]

It was a long time ago but I think this was the paper. Everything might not match as I was just making the tutorial to show how to use the model. doi.org/10.1016/j.ces.2005.05.044

[@Our_traveldairies]

@@NazmulHossain-nb4lc thank you so much for your response and if any related references is there for this simulation, provide me that references also , that will helpful for my project .

[@NazmulHossain-nb4lc]

@@Our_traveldairies I have an old work that is recently published which has a lot of good references on this type of project. you can check this out. doi.org/10.1016/j.partic.2022.08.003 If you don't have access, send me an email.

[@umarfarooq5402]

Hello Sir, Can you please send me an email?