{"id":312375,"date":"2023-10-19T15:57:25","date_gmt":"2023-10-19T15:57:25","guid":{"rendered":"\/forum\/forums\/reply\/312375\/"},"modified":"2023-10-19T15:57:25","modified_gmt":"2023-10-19T15:57:25","slug":"312375","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/312375\/","title":{"rendered":"Reply To: How to apply the current along the -z direction?"},"content":{"rendered":"<p>&lt;p&gt;Hi Zhongchao,&lt;\/p&gt;&lt;p&gt;Actually, I&#8217;m quite certain your APDL code will apply the current in a direction <em>normal<\/em> to the surface at z=8.33E-3 (as you intend it to). My guess is that your concern stems from the <em>appearance<\/em> of the symbol representing your applied AMPS load (e.g., the image created by \/PBC,AMPS,,1 followed by EPLOT). Current is a scalar, not a vector. In MAPDL, symbols representing applied scalar loads are always displayed pointing in the x direction. The \/PBC documentation alludes to this, though the description is admittedly pretty vague:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/19-10-2023-1697729689-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;Coupling the VOLT DOF on the surface as you have, the calculated voltage of all the nodes on that surface will have the same value =&gt; there will be no voltage gradient tangent to that surface =&gt; current will only be allowed to flow perpindicular to that surface.&nbsp;&lt;\/p&gt;&lt;p&gt;One thing that may be a problem though (I&#8217;m not sure) is the last two lines of your code. After coupling VOLT, one typically applies <em>&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;all&lt;\/span&gt;<\/em> of the current to be applied at the surface to the single &#8220;master&#8221; (lowest numbered) node of the coupled degree of freedom set. I&#8217;m not sure applying current to the other non-master nodes (as you have done) will be recognized by MAPDL. You may end up having only I\/TotalNodes current applied to the surface. The single command I would use in place of your last two commands is:&lt;\/p&gt;&lt;p&gt;F,ndnext(0),AMPS,I&nbsp; &nbsp;!&nbsp; APPLY ALL CURRENT ON THE NEXT HIGHEST NUMBERED NODE ABOVE ZERO&lt;\/p&gt;&lt;p&gt;I&#8217;m confident that will work correctly.&lt;\/p&gt;&lt;p&gt;Kind regards,&lt;\/p&gt;&lt;p&gt;Bill&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-312375","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Zhongchao,Actually, I&#039;m quite certain your APDL code will apply the current in a direction normal to the surface at z=8.33E-3 (as you intend it to). My guess is that your concern stems from the appearance of the symbol representing your applied AMPS load (e.g., the image created by \/PBC,AMPS,,1 followed by EPLOT). Current is\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/312375\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: How to apply the current along the -z direction? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi Zhongchao,Actually, I&#039;m quite certain your APDL code will apply the current in a direction normal to the surface at z=8.33E-3 (as you intend it to). My guess is that your concern stems from the appearance of the symbol representing your applied AMPS load (e.g., the image created by \/PBC,AMPS,,1 followed by EPLOT). 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My guess is that your concern stems from the appearance of the symbol representing your applied AMPS load (e.g., the image created by \/PBC,AMPS,,1 followed by EPLOT). 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My guess is that your concern stems from the appearance of the symbol representing your applied AMPS load (e.g., the image created by \/PBC,AMPS,,1 followed by EPLOT). 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My guess is that your concern stems from the appearance of the symbol representing your applied AMPS load (e.g., the image created by \/PBC,AMPS,,1 followed by EPLOT). Current is","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/312375\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/19-10-2023-1697729689-mceclip0.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/19-10-2023-1697729689-mceclip0.png","article:published_time":"2023-10-19T15:57:25+00:00","article:modified_time":"2023-10-19T15:57:25+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: How to apply the current along the -z direction? | Ansys Learning Forum","twitter:description":"Hi Zhongchao,Actually, I'm quite certain your APDL code will apply the current in a direction normal to the surface at z=8.33E-3 (as you intend it to). 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