<div><div style="   ;;  "><font size="2"><span style="font-family: Times New Roman;"><font size="4">Dear <span class="addrtitle"></span><span><span class="grn">Paolo Giannozzi</span> </span>,</font></span></font></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4"><br></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4"><span class="fontstyle0"></span><span class="fontstyle0"> I want to apply a constant velocity </span><span class="fontstyle0"><span class="fontstyle0">along the y direction on the upper atoms through the whole progress  </span><span class="fontstyle0">using cp.x in <span style="white-space: pre-wrap;" lang="EN-US">Quantum Espresso 6.1. version</span><span style="white-space: pre-wrap;" lang="EN-US"></span>. </span> <br></span></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4"><span class="fontstyle0"><br></span></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4"><span class="fontstyle0">The </span>Card:<span> </span><span class="card">ATOMIC_VELOCITIES</span><span> </span>{<span> </span><span class="flag">a.u</span><span> </span>},in the the manual ,which shows tha<span style="background-color: rgb(255, 255, 255);">t<span style="font-weight: bold;"> </span><span style="font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"><span style="font-weight: bold;">ion_velocities=</span></span><span style="font-weight: bold;"> 'fr</span></span><span style="font-weight: bold;">om_input' </span> : restart the simulation with atomic velocities read
<span style="font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 153); text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"></span>from standard input . <br></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4">BEWARE: works only if restart_mode='from_scratch', tested only with electrons_dynamics='cg'.</font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4"><br></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4">The question is that </font></span><span style="font-family: Times New Roman;"><font size="4">if I read the input file with the c<span style="background-color: rgb(255, 255, 255);">ard <span style="font-weight: bold;"><span style="font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">restart_mode=</span>'from_scratch'</span>,</span></font></span><span style="font-family: Times New Roman;"><font size="4"><span style="background-color: rgb(255, 255, 255);"><span style="font-family: Times New Roman;"><font size="4">the <span class="fontstyle0">constant velocity in the input file can be applyed </span></font></span>,while the information about electrons and ions <span class="fontstyle0">after having been minimized and displaced from their equilibrium positions</span> 
</span></font></span><span style="background-color: rgb(255, 255, 255);"></span><span style="font-family: Times New Roman;"><font size="4"><span style="background-color: rgb(255, 255, 255);">may be ignored. if I read the input file with the card <span style="font-weight: bold;"><span style="font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">restart_mode=</span>'re</span></span><span style="font-weight: bold;">start'</span>,the <span class="fontstyle0">constant velocity in the input file cannot be applyed.</span></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4"><br></font></span></div><div style="   ;;  "><span style="font-family: Times New Roman;"><font size="4">If I have ignored something during the progress ?</font></span><span style="font-family: Times New Roman;"><font size="4"><br><span class="fontstyle0"></span></font></span><span style="font-family: Times New Roman;"><font size="4"><span style="font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 153); text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"></span></font></span></div><span style="font-family: Times New Roman;"><font size="4"><span class="fontstyle0"></span></font></span><div style="   ;;  "><div><span style="font-family: Times New Roman;"><font size="4"><span style="white-space: pre-wrap;"><br></span></font></span></div><div><span style="font-family: Times New Roman;"><font size="4"><span style="white-space: pre-wrap;">Any help would be appreciated.</span></font></span></div><div><span style="font-family: Times New Roman;"><br></span></div></div><div style="   ;;  "><pre style="line-height: 23.8px; margin-top: 0px; margin-bottom: 0px;"><div style="white-space: normal;"><div><span style="font-family: Times New Roman;"><font size="4">Thank you!</font></span></div><div><font size="4"><span style="font-family: Times New Roman;">Best regards,</span></font></div></div><div style="white-space: normal;"><font size="4"><span style="font-family: Times New Roman;"><br></span></font></div><div style="white-space: normal;"><font size="4"><span style="font-family: Times New Roman;">------</span></font></div><div style="font-family: Verdana; white-space: normal;"><p class="MsoNormal" style="line-height: 17.85pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" align="left"><font size="4"><span style="font-family: Times New Roman;"><span lang="EN-US">LU Hailin, Graduate Student</span></span></font></p><p class="MsoNormal" style="line-height: 17.85pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" align="left"><font size="4"><span style="font-family: Times New Roman;"><span lang="EN-US">State Key Laboratory of Mechanical Transmission, Chongqing University</span></span></font></p><p class="MsoNormal" style="line-height: 17.85pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" align="left"><font size="4"><span style="font-family: Times New Roman;"><span lang="EN-US">Chongqing 400044, China</span></span></font></p><p class="MsoNormal" style="line-height: 17.85pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" align="left"><span lang="EN-US"><span style="font-family: Times New Roman;"><font size="4">Tel: (+86) 18362360286</font></span></span></p></div></pre></div></div>