Solidification Shrinkage and Porosity Model

jk75 · August 4, 2009, 11:16

Hi everybody,

does anybody have experience with the solidification model (the RSS, for a start) in Flow3D?
Especially I'd like to know how the solidifictaion - and thus the shrinkage - is actually calculated. The manual only states that 'at each step a specific volume is subtracted from the top of each region'. Is there a little bit more information about that model to be found somewhere?
Also I'm not sure how (if at all) this model can be adapted by the user through settings or parameters. Is it possible to adapt the model to a specific geometry, for example?

Thanks in advance and best regards,
Johannes

MuxaB · August 13, 2009, 23:45

There is an oldish technical note on some additions to the heat transfer model, including RSS, here http://www.flow3d.com/pdfs/tn/FloSci-TN43.pdf. It may help.

The model takes into account the geometry and solidification dynamics of the melt. The main controls are the liquid and solid densities, and the critical and coherency solid fractions. Feeding stops at the critical solid, while at the coherency point the feeding switches from following the direction of gravity to that of the temperature gradient.

I am not sure i answered your questions. let me know.

August 4, 2009, 11:16	Solidification Shrinkage and Porosity Model	#1
jk75 New Member Johannes Köpf Join Date: May 2009 Location: Germany Posts: 29 Rep Power: 17	Hi everybody, does anybody have experience with the solidification model (the RSS, for a start) in Flow3D? Especially I'd like to know how the solidifictaion - and thus the shrinkage - is actually calculated. The manual only states that 'at each step a specific volume is subtracted from the top of each region'. Is there a little bit more information about that model to be found somewhere? Also I'm not sure how (if at all) this model can be adapted by the user through settings or parameters. Is it possible to adapt the model to a specific geometry, for example? Thanks in advance and best regards, Johannes

August 13, 2009, 23:45		#2
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Location: Sante Fe, New Mexico, USA Posts: 337 Rep Power: 18	There is an oldish technical note on some additions to the heat transfer model, including RSS, here http://www.flow3d.com/pdfs/tn/FloSci-TN43.pdf. It may help. The model takes into account the geometry and solidification dynamics of the melt. The main controls are the liquid and solid densities, and the critical and coherency solid fractions. Feeding stops at the critical solid, while at the coherency point the feeding switches from following the direction of gravity to that of the temperature gradient. I am not sure i answered your questions. let me know.