I'm simulating a gas-solids flow into a FCC Riser using Ansys Fluent 14.5, and I need to set the condition so that steam flows into riser from the beginning, and 10 s later gasoil starts flowing into the riser from another inlet.
Somebody knows how can I define this condition?
Any help is very welcome.
Regards,
Hello Mr Paz-Paredes.
are you using a multiphase model (mixture, eulerian, vof etc)?
Generally, I would say that there are two ways to do it:
1. (the easy one) Start the simulation with a volume fraction of gasoil=0 at the inlet. Stop the simulation after 10 sec. Modify your BC setting up the VF of gasoil. Restart the simulation without initialisation.
2. You can implement a time -varying volume fraction subroutine using User Defined Functions (UDF): if( t
Hello Mr Paz-Paredes.
are you using a multiphase model (mixture, eulerian, vof etc)?
Generally, I would say that there are two ways to do it:
1. (the easy one) Start the simulation with a volume fraction of gasoil=0 at the inlet. Stop the simulation after 10 sec. Modify your BC setting up the VF of gasoil. Restart the simulation without initialisation.
2. You can implement a time -varying volume fraction subroutine using User Defined Functions (UDF): if( t
Thanks Dimitros, and yes I'm using the multiphase eulerian model. I think I'll try both options.
Regards,
Ignacio
It is better to use the UDF option using DEFINE PROFILE macro to initiate the gas oil volume fraction and also the inlet velocity by capturing the FLOW_TIME variable.
Ok, thanks Subhasish, now I'm writing the UDF, today later I'll test it and I'll see how it works.
Mr Paz-Paredes
you may define an expression for gasoil inlet, like;
if (t
Thanks Chandra, I'm working on implementing many options, so when I'll have some results, i'm going to do some additional comments about this issue.
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