How to apply the temperature boundary condition on the outside of the mould?
I am trying to simulate a simple sand casting process, in which hot melt flows in the cavity of the mould and cooling channel is applied on the outside of the mould.
I would like to set the outside boundary of the mould a fixed temperature as a cooling condition, however, when I use “Model setup-Boundaries-Mesh Boundaries-Block-Wall or others”, it doesn’t work at all no matter what temperature I set.
So my question is that how to apply the temperature boundary condition on the outside of the mould?
you can set initial solid temperature for the mold under Meshing & Geometry -> Component -> Initial Conditions -> Temperature. But this is just an initial temperature for the solid object. For isothermal temp setting you may want to try Boundaries -> Wall -> Thermal Boundary Options -> Temperature. Hope this help.
The geometry is very simple, a rectagular mould with a cylinder cavity, I set the 4 sides of the mould as "wall" boundaries and change the temperature in the "thermal information", but the results didn't change at all even the wall temperature is unreasonable high or low.
I am so confused
The Prepin data is as follows, in which the wall temperature is unreasonable, I just want to check if it works or not.
This is a sample input file
remark='units are ...',
ifenrg=2, iwsh=0, ihtc=2,
rhofs=2680., cv1=1194., cvs1=963., thc1=116.8,
thcs1=152., clht1=3.89e+05, ts1=539.6, tl1=615.9,
tniyam=-1., tsdrg=1., mui=0., mu1=0.0012,
muc00=0., muc0=1., muc1=0., muc2=0.,
muc3=0., muc4=0., mutmp1=0., mutmp2=0.,
mutmp3=1., muthk=0., muthn0=0., muthn1=0.,
teut=0., cexf1=0., cstar=0., dratio=0.,
pcoef=0., fluid1='Aluminum Alloy A357', units='SI',
wl=2, wr=2, wf=2, wbk=2,
wb=2, wt=5, pbct(1,6)=243.7, tbct(1,6)=620.,
tbct(1,1)=1e7, hwall1(1)=1e6, hwall2(1)=1e6,
px(1)=-0.8, py(1)=-0.8, py(2)=0.8, pz(1)=-0.4,
iob(2)=1, ioh(2)=1, xl(2)=-0.8, xh(2)=0.8,
yl(2)=-0.8, yh(2)=0.8, zl(2)=-0.4, zh(2)=1.5,
magnx(2)=1., magny(2)=1., magnz(2)=1.,
subcmpid(2)='Rectanguar', material(1)='Steel H-13', twobs(1,1)=294.,
kobs(1)=28.6, rcobs(1)=3.5618e+06, hobs1(1)=20000., hobs2(1)=-1.,
obsid(1)='Moud and cavity',
subcmpid(3)='Cylinder', iob(3)=1, ioh(3)=0, zl(3)=0.,
zh(3)=1.5, rah(3)=0.4, magn(3)=1., magnx(3)=1.,
magny(3)=1., magnz(3)=1., rotx(3)=0., roty(3)=0.,
rotz(3)=0., trnx(3)=0., trny(3)=0., trnz(3)=0.,
hobv1(1)=0., hobv2(1)=0., hobv3(1)=0.,
Documentation: general comments, background, expectations, etc.
#end start tables
strange i did try myself, it also didn't work out with V9.4.1. So anyone have this problem before?
CK, I finally found the problem.
Even I used a so high temperature and long cooling time, the heat transfer coefficient l used above was still not big enough, comparing to the distance between the heat source and the boundaries.
Increase the thermal conductivity or shorten the distance of the boundaries, the boundary temperature will play a part.
|All times are GMT -4. The time now is 16:19.|