|
[Sponsors] |
[Q] Inintial condition in multiphase, multicomponent problem. |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
May 11, 2015, 06:10 |
[Q] Inintial condition in multiphase, multicomponent problem.
|
#1 |
Member
Jinwhan Ryuk
Join Date: Feb 2013
Location: South Korea
Posts: 91
Rep Power: 13 |
I am calculating CFBC(Circulating Fluidized Bed Combustion) problem. I modified this problem as multi component multiphase problem by using CFX Tutorial, coal combustion. Unfortunately, Because of muticomponent mutiphase condition I cannot set initial volume fraction of sand in the boiler. I did not set combustion yet. I solve flow first and move to combustion. Does anyone give me a piece of advice how to do this?
|
|
May 11, 2015, 06:53 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,850
Rep Power: 144 |
What is stopping you set the sand volume fraction initial condition?
|
|
May 11, 2015, 22:03 |
|
#3 |
Member
Jinwhan Ryuk
Join Date: Feb 2013
Location: South Korea
Posts: 91
Rep Power: 13 |
Error #001100279 has occurred in subroutine ErrAction. Massage: The particle mass fractions have to add up to a total of one with a tolerance of 1%. The sum of the user specified values exceeds this threshold. <-This message came up independent of initial condition when particle calculatin begins.
|
|
May 12, 2015, 07:47 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,850
Rep Power: 144 |
So doesn't the error message tell you exactly what is wrong?
A good way forward is to set one phase to be initial value: Automatic so then it automatically calculates a value which makes the total volume fractions sum to 1. |
|
May 14, 2015, 01:06 |
|
#5 |
Member
Jinwhan Ryuk
Join Date: Feb 2013
Location: South Korea
Posts: 91
Rep Power: 13 |
I found error and fix it temporarily. I changed Discrete Partticle Diameter Distribution to specified Diameter. The error has gone. Every particle(Limestone, coal, sand)has particle size distribution and mass fraction. Maybe I put wrong Mass Fraction List or Number Fraction list. I made Mass Fraction List sum be 1 indivisually. Do we have to think all componet mass fraction(calculated one component individual mass fraction/total component mass fraction)? But I am not confident about setting Number Fraction List according to mass fraction list. I put the same fraction to make sum 1.Perhaps it caused the error, I think.
Thank you very much ghrrocks. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Problem with assigned inlet velocity profile as a boundary condition | Ozgur_ | FLUENT | 5 | August 25, 2015 05:58 |
How to use a solution as an inlet boundary condition in another problem in fluent | geryes | FLUENT | 0 | February 25, 2010 17:32 |
multiphase mixing Problem with MRF model in MixSim | Srinivas | FLUENT | 0 | October 17, 2005 07:35 |
multiphase or multicomponent.... That's the probl | july | Siemens | 1 | March 7, 2002 03:27 |
a problem with Boundary condition | M Rad | Main CFD Forum | 12 | November 27, 1998 13:49 |