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<p>Hi,</p>
<p>You might want to use the BDRY_VAR variable to define your solid.
This variable can be assigned to every cell, positive value
correspond to rigid body.<br>
You will need to add for each time step a loop to check the
conditions inside the rigid body and change the BDRY_VAR to
negative value when it should change state (melting / boiling
point).</p>
<p>Best regards,<br>
G. Rigon<br>
</p>
<div class="moz-cite-prefix">Le 04/09/2019 à 11:05, leizhuray a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:76DAC217-724D-4A5C-9C31-041C13E79BA9@pku.edu.cn">
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<div><span>According to you simulation results, expansion
just occurs in the left corner. This may be due to laser
heating in LaserSlab. You can check the 'depo' in chk data
file to make sure about this. </span></div>
<div><span><br>
</span></div>
<div><span><br>
</span></div>
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<div
style="font-size:12px;line-height:1.5;word-break:break-all;margin-left:10px;margin-right:10px">On
<span class="mail-date">9/4/2019 16:45</span>，<a
class="mail-to"
style="text-decoration:none;color:#2a83f2;"
href="mailto:zdy0903@stu.xjtu.edu.cn"
moz-do-not-send="true">Zhang
Daoyuan<zdy0903@stu.xjtu.edu.cn></a> wrote： </div>
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<blockquote id="ntes-pcmail-quote" style="margin: 0; padding: 0;
font-size: 14px; font-family: '微软雅黑';">
<p> <span style="font-family:SimSun;">Hi all!</span>
</p>
<p> <span style="font-family:SimSun;"> For a lot of
simulations, if I want to initialize it from room
temperature (300K) like LaserSlab, I find that there is
thermal expansion at the interface between the solid </span><span
style="font-family:SimSun;">slab and low density gas at
room temperature. This is beacause the material strengh is
not taken into account in the simulation so that the
pressure for solid slab at 300K is very high. This is not
physical in reality.</span>
</p>
<p> <span style="font-family:SimSun;"> It can be shown on
the picture below, this is density and velocity at y
direction distribution for LaserSlab simulation at 1e-11
s.</span>
</p>
<p> <span style="font-family:SimSun;"><img
src="cid:part2.122D3BC0.2A65E33A@polytechnique.edu"
class=""><img
src="cid:part3.941294BE.7E5729B3@polytechnique.edu"
class=""><img
src="cid:part4.4A7F6C1C.DF15B360@polytechnique.edu"
class=""></span>
</p>
<p> <br>
</p>
<p> <span style="font-family:SimSun;"><br>
</span>
</p>
<p> <span style="font-family:SimSun;"><br>
</span>
</p>
<p> <span style="font-family:SimSun;"> To solve this
problem, an idea is that keep the solid at stationary till
the melting or boilding point. I need to force the
velocity to be zero in the simulation. In FLASH, how can I
do that?</span>
</p>
<p> <span style="font-family:SimSun;"> This is important to
my simulation because my simulation is about Z pinch which
use a current to heat solid. Before the solid reach to the
melting teperature, the current will heat the unphysical
thermal expanded materials to very high temperature.</span>
</p>
<p> <span style="font-family:SimSun;"> Thanks a lot!</span>
</p>
<p> <span style="font-family:SimSun;"><br>
</span>
</p>
<p> <span style="font-family:SimSun;"><br>
</span>
</p>
<p> <span style="font-family:SimSun;">Yours</span>
</p>
<p> <span style="font-family:SimSun;">Zhang </span>
</p>
<p> <span style="font-family:SimSun;"><br>
</span>
</p>
<p> <span style="font-family:SimSun;"><br>
</span>
</p>
</blockquote>
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<pre class="moz-signature" cols="72">--
Gabriel Rigon
--
Ph.D. student
Laboratoire LULI
Ecole Polytechnique
91128 Palaiseau cedex, France
Tél : +33-(0)1 69 33 54 21</pre>
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