help

Brooks Li · July 10, 2009, 05:01

I want to simulate a metal injection molding process using CFX.In this situation , we mix the metal powder(solid particle) with the binder(continuous liquid) together,usually the metal powder have a high volume farction(50%-75%).we set the injection velocity 10m/s and temperature 400k.which model should i use? solid particle collision models? How can i monitor the filling process, i mean how to determine is it full filled or not? thanks!

Rui · July 10, 2009, 06:48

In my opinion, one should always start by doing the simplest simulation representative of the real problem, and then increase complexities step by step.

So, try first to do the simplest simulation you can:
- simple geometry
- assume you have only a continuous fluid (I guess you can assume the viscosity and density are functions of the of the percentage of metal powder you are using - And actually, I think this will be the only way to do it)
- Isothermal (you can leave the energetic part of the problem for a next step, when you've "mastered" the filling problem)

A filling problem is a complex process ... two-phase, free surface, transient.
Good luck. And keep us informed about your successes and unsuccesses.

ghorrocks · July 10, 2009, 07:01

Hi Rui,

Your thesis is a good reference for this type of work. Can you give us the URL again?

Thanks,
Glenn

ckleanth · July 10, 2009, 08:14

CFD-Wikdonated_texts

longbow · July 10, 2009, 08:16

There are tools dedicated to injection molding process simulation. Have you taken a look at them? CFX is a general purpose CFD tool. It may not be the best one to accomplish what you want to do.

Rui · July 10, 2009, 08:33

Cheers for providing the link, mate

You can also find that link, and a link to a site I have on GooglePages with my thesis in a better pdf quality, from my blog here on CFD-Online: http://www.cfd-online.com/Forums/blo...er-thesis.html (trying to draw some visitors )

ckleanth · July 10, 2009, 08:46

Quote:

Originally Posted by Rui

Cheers for providing the link, mate

np mate, need to do something anyway while waiting for simulations to converge

July 10, 2009, 05:01	help	#1
Brooks Li New Member Qiaojie Li Join Date: Jul 2009 Posts: 3 Rep Power: 16	I want to simulate a metal injection molding process using CFX.In this situation , we mix the metal powder(solid particle) with the binder(continuous liquid) together,usually the metal powder have a high volume farction(50%-75%).we set the injection velocity 10m/s and temperature 400k.which model should i use? solid particle collision models? How can i monitor the filling process, i mean how to determine is it full filled or not? thanks!

July 10, 2009, 06:48		#2
Rui Member Rui Igreja Join Date: Mar 2009 Location: Aveiro Posts: 68 Blog Entries: 1 Rep Power: 17	In my opinion, one should always start by doing the simplest simulation representative of the real problem, and then increase complexities step by step. So, try first to do the simplest simulation you can: - simple geometry - assume you have only a continuous fluid (I guess you can assume the viscosity and density are functions of the of the percentage of metal powder you are using - And actually, I think this will be the only way to do it) - Isothermal (you can leave the energetic part of the problem for a next step, when you've "mastered" the filling problem) A filling problem is a complex process ... two-phase, free surface, transient. Good luck. And keep us informed about your successes and unsuccesses. __________________ Rui

July 10, 2009, 08:14		#4
ckleanth Senior Member George Join Date: Mar 2009 Location: Birmingham, UK Posts: 257 Rep Power: 18	CFD-Wikdonated_texts __________________ Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials

July 10, 2009, 08:33		#6
Rui Member Rui Igreja Join Date: Mar 2009 Location: Aveiro Posts: 68 Blog Entries: 1 Rep Power: 17	Cheers for providing the link, mate You can also find that link, and a link to a site I have on GooglePages with my thesis in a better pdf quality, from my blog here on CFD-Online: http://www.cfd-online.com/Forums/blo...er-thesis.html (trying to draw some visitors ) __________________ Rui

July 10, 2009, 07:01		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Hi Rui, Your thesis is a good reference for this type of work. Can you give us the URL again? Thanks, Glenn

July 10, 2009, 08:16		#5
longbow New Member Join Date: Apr 2009 Posts: 14 Rep Power: 17	There are tools dedicated to injection molding process simulation. Have you taken a look at them? CFX is a general purpose CFD tool. It may not be the best one to accomplish what you want to do.