{"id":204,"date":"2022-09-26T13:28:32","date_gmt":"2022-09-26T04:28:32","guid":{"rendered":"https:\/\/www.ssil.co.jp\/product\/EMSolution\/en2\/?post_type=case&p=204"},"modified":"2022-09-26T17:40:14","modified_gmt":"2022-09-26T08:40:14","slug":"porous_steady-state_current","status":"publish","type":"case","link":"https:\/\/www.ssil.co.jp\/product\/EMSolution\/en\/case\/porous_steady-state_current\/","title":{"rendered":"Steady-state current field analysis of porous materials"},"content":{"rendered":"

Summary<\/h3>\n

This section introduces the steady-state current field analysis function using a simple model. This function is implemented together with the "Electrostatic Field Analysis"<\/font><\/a> function and allows you to obtain the steady-state current distribution in a conductor when DC is applied. If you want to obtain the magnetic field distribution due to the current as well, please refer to "DC Current Field Analysis"<\/font><\/a>. <\/p>\n

Explanation<\/h3>\n

A two-dimensional analysis is performed using the conductor model simulating the porous material shown in Fig. 1. A DC current of 10 A is applied from the top surface, and the granular conductor is set to 1\/10 of the conductivity of the surrounding conductors. Periodic boundary conditions are assumed in the left and right directions. Fig. 2 shows the current density distribution diagram. Since the conductivities differ by a factor of 10, it can be seen that the current flows in such a way as to almost avoid the granular conductors. <\/p>\n

Next, let us analyze the granular conductor as a nonconductor. Fig. 3 shows the current density distribution, which is almost the same as in Fig. 2, but the current entering the nonconductor is zero. <\/p>\n

This is a brief introduction to steady-state current field analysis. Since this function only models the conductive part, no mesh is needed for the non-conductive part such as air. It is useful when you want to analyze a steady-state current field. <\/p>\n

\n
\n
\n \"\"<\/a>
\n<\/p>\n

Fig. 1 Two-dimensional porous model<\/p>\n<\/p><\/div>\n

\n
\n \"\"<\/a>
\n<\/p>\n

Fig.2 Current density vector distribution [$A\/m^2$]<\/p>\n<\/p><\/div>\n<\/div>\n

Next, let us analyze a granular conductor as a nonconductor. Fig. 3 shows the current density distribution, which is almost the same as in Fig. 2, but the current entering the nonconductor is zero. <\/p>\n

\n
\n
\n \"\"<\/a>
\n<\/p>\n

Fig.3 Current density vector distribution [$A\/m^2$]<\/p>\n<\/p><\/div>\n<\/div>\n

This is a brief introduction to steady-state current field analysis. This function models only the conductive part, so meshing of air and other non-conductive parts is not necessary. It is useful when you want to analyze a steady-state current field. <\/p>\n

<\/p>\n

How to use<\/h3>\n

Please set STATIC=3: Steady Current Field Analysis (see "2. Type of Analysis" of Handbook) and set the following: <\/p>\n

(i) Set SIGMA in Hand book "15.1.2 Volume Element Characteristics".<\/h4>\n

* MAT_ID * EPS * SIGMA *<\/font><\/span>
\n 1 1 1e+007<\/font><\/span>
\n* MAT_ID * EPS * SIGMA *<\/font><\/span>
\n 2 1 1e+008<\/font><\/span>\n<\/p>\n

(ii) Set Equipotential Surface Electric Field Sources in Hand book "17.9 Equipotential Surface Electric Field Sources".<\/h4>\n