Learning Forum

[charitra22]

i am working on fluidised bed and every time i am getting this type of problem during simulation .........please any one help me ?

[Aitor]

Could you please give an overview of your problem? Your goal, geometry, BCs, mesh, physical models and numerical methods that are you using...The more data, the better.

[charitra22]

my goal is to study the hydrodynamics and temperature profile of the fluidised bed dryer ngeometry - i attached belownBC - air inlet velocity 60m/sn air inlet temp 400Kn time step size 0.01n convergence criteria 1*10^(-5)n nodes 88343n elements 462312nPhysical model - euler euler modelnsolver type- pressure based seggregated solver nturbulence model RNG k-ennear wall moodelling - standard wall functionnphase intraction model - syamlal O Brien n

[Aitor]

Where is the inlet? And what about the outlet?nCould you post a screenshot of a section of the mesh? A cut with the YZ plane, for example.n

[Rob]

What's the initial particle packing set to? 60m/s may require a smaller time step too, what's the courant number in your domain? n

[charitra22]

inlet is perforated plate ......above in picnnn

[charitra22]

n

[charitra22]

any one ?????.

[DrAmine]

The mesh is really not ideal: what does Fluent tell if you issue mesh check and quality.nPlease also be more patient.n

[charitra22]

ok. I am trying to simulate dryying process also will you please help me to define wet solid in fluent and moisture content measurement.n

[Rob]

You'll need a mixture for the gas phase (air and water vapour as a guess) and a mixture for the solid, probably solid+water_liquid. Then you'll need the phase change models. That'll be more complicated. n