
[Sponsors] 
November 20, 2013, 03:29 
Can this simulation be created using CFD?

#1 
Member
Join Date: Aug 2013
Posts: 60
Rep Power: 5 
I want to create a simulation in which the viscosity of the material varies with time and temperature, by this I mean if you place this material on a plate at constant temperature,over time its viscosity will change. The viscosity of the material will initial decrease and then after time t it will start increasing at an exponential rate.
I would like to simulate this for varying geometries, temperatures and materials. Is this even possible to simulate using CFD or does it require a different simulation type? If possible using CFD could anyone give me any guidance on what I need to understand before attempting something like this? 

November 20, 2013, 05:36 

#2  
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,412
Rep Power: 31 
Quote:


November 20, 2013, 09:05 

#3 
Member
Join Date: Aug 2013
Posts: 60
Rep Power: 5 
I can obtain rehometer readings which generate a graph which shows the torque versus time readings for a set temperature, is this what would be required? If not I can obtain further information.


November 20, 2013, 09:39 

#4  
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,412
Rep Power: 31 
Quote:
are you able to create a database and use continuous values by interpolation of discrete datas? If so, you can do CFD simulation using an access to such datas to compute viscosity as function of time and temperature 

November 20, 2013, 16:40 

#5 
Member
Join Date: Aug 2013
Posts: 60
Rep Power: 5 
I can obtain the values to create this database however, what would I use to create this, would it be something that is created within the CFD software used or an external software package?
Is this considered a nonisothermal flow simulation? Could this be simulated using some sort of standard solidification model? The viscosity variations occur because of a reaction within the material, therefore would this require some form of a reaction solver or should the database values cover this? 

November 20, 2013, 18:00 

#6  
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,412
Rep Power: 31 
Quote:
Consider that mu=mu(Theta,t) is required in the momentum and energy equation; if you can prescribe it by some mathematical law or experimental datas, you can set as boundary condition. Otherwise, you should solve timebytime the reaction equation that governs its evolution, coupling that to the flow equations. 

November 20, 2013, 18:23 

#7 
Member
Join Date: Aug 2013
Posts: 60
Rep Power: 5 
The material I am working with is rubber and the process is known as curing, the test results obtained which the mathematical model will be generated from apply to a simple block geometry of a small volume. For larger geometries the time required for this solidification (curing of rubber) is much longer, will using mu=mu(Theta,t) take this into account or will I have to use the timebytime reaction equation?


Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Is real time CFD simulation possible  yedla  Main CFD Forum  5  March 28, 2016 09:56 
CFD Design...The CFD Future  John C. Chien  Main CFD Forum  20  November 20, 2015 00:40 
CFD Modelling & Simulation of Boiler Flue Fas Flow  jaspernare  CFD Freelancers  7  July 25, 2013 02:57 
CFD simulation of Progressive cavity Pump  MrinalKR  CFX  4  September 13, 2012 07:36 
Solidification CFD simulation  MinHua Wang  FLUENT  0  February 28, 2001 18:40 