Hi,
I want to be able to
track the current and last distance traveled for my phase field model so I can
calculate velocity (for plotting, recording), and use this to impliment dynamic
time stepping.
In reading the
"reference-1.0.pdf" I see that there is a DistanceFunction, and maybe that is
what I want, but it is listed under the level set section, and seems to defined
in a rather specific case for certain phase and gradient conditions. This
same function is cross referenced, or linked back to the cell variables section
of the manual.
The dynamic time
stepping scheme (per Loginova et al) I hope to impliment works as
follows.
The Courant number
is = V(velocity during last time step) *[dtold(last time step)/dx(grid
spacing)]
for V, I'll need the
current front distance (XC) value and old front distance (XO)
value for some defined value of the 'phase' variable (ie phaseCriteria =0.5 or
perhaps 0.95?). How do I get the current and old front distance values where
phase = phaseCriteria
Then V =
(XCurrent @ phase=phaseCriteria - XOld @
phase=phaseCriteria)/dtold
If the Courant
number is less than a critical value (say CourantCrit = 0.5)
then
dtnew (the new time
step) = CourantCrit * dx/V
In addtion I'd want
to plot velocity versus time for Isothermal cases, and velocity versus time,
and/or temperature for continuous cooling cases.
What implications
might this approach have on the peclet number issue, and how can one assure that
the peclet number criteria is not being violated? Is this inherent in the
solver choosen, or should it be monitored and verified?
Any help would be
greatly appreciated.
Thanks,
E. Buddy Damm
Principal Materials Engineer
Timken
Research - MC RES 13
1835 Dueber Ave.
SW
PO Box 6930
Canton, OH 44706-0930
p. 330-471-2703
f.
330-458-6530
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