{"id":293028,"date":"2023-07-14T02:30:22","date_gmt":"2023-07-14T02:30:22","guid":{"rendered":"\/forum\/forums\/topic\/piston-motion-problem-dynamic-mesh-and-fluid-zone-motion\/"},"modified":"2023-07-16T09:04:01","modified_gmt":"2023-07-16T09:04:01","slug":"piston-motion-problem-dynamic-mesh-and-fluid-zone-motion","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/piston-motion-problem-dynamic-mesh-and-fluid-zone-motion\/","title":{"rendered":"Piston motion problem: Dynamic mesh and fluid zone motion"},"content":{"rendered":"

        <\/span>Hello,<\/p>\n

        <\/span>I want to simulate the motion of a piston which contains an oil film(about 50 um thick) at the bottom of it, all fluid parts are shown in Figure 1<\/strong>, each fluid zone is connected by interface.<\/p>\n

        <\/span>The moving zones consist of 4 parts, shown in Figure 2<\/strong>:<\/p>\n

(1) the bottom face of piston cylinder, which is labelled as moving face;<\/p>\n

(2) fluid zone 2;<\/p>\n

(3) fluid zone 3;<\/p>\n

(4) fluid zone 4;<\/p>\n

        <\/span>During the motion, piston cylinder is in the suction stage, i.e. the moving parts move along the axis-x with the same velocity V, shown as Figure 3<\/strong>.<\/p>\n

        <\/span>I know this motion involves with dynamic mesh and UDF, besides, if without the fluid zone 2, 3, 4, I can use UDF “CG_MOTION” to realize the motion of piston, but once the three other fluid zones are added, I have no idea how to deal with.<\/p>\n

       <\/span>Any advice would be appreciated.<\/p>\n

Regards,<\/p>\n

<\/p>\n

Figure 1<\/strong><\/p>\n

<\/p>\n

Figure 2<\/strong><\/p>\n

<\/p>\n

Figure 3<\/strong><\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-293028","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t