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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>
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<div id="ntes-pcmail-signature-default" style="font-size:14px; color:#000; text-decoration: none;">发自网易邮箱大师</div> </font>
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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">Zhang Daoyuan<zdy0903@stu.xjtu.edu.cn></a> wrote： </div>
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<span style="font-family:SimSun;">Hi all!</span>
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<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>
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<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>
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<span style="font-family:SimSun;"><img src="cid:3d877e97$1$16cfb88364e$Coremail$zdy0903$stu.xjtu.edu.cn"><img src="cid:144d5557$2$16cfb88364e$Coremail$zdy0903$stu.xjtu.edu.cn"><img src="cid:22d544c2$3$16cfb88364e$Coremail$zdy0903$stu.xjtu.edu.cn"></span>
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<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>
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<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>
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<span style="font-family:SimSun;"> Thanks a lot!</span>
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<span style="font-family:SimSun;">Yours</span>
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<span style="font-family:SimSun;">Zhang </span>
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