{"id":382576,"date":"2024-09-13T07:53:22","date_gmt":"2024-09-13T07:53:22","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/6dof-udf-does-not-seem-to-work\/"},"modified":"2024-09-13T07:53:22","modified_gmt":"2024-09-13T07:53:22","slug":"6dof-udf-does-not-seem-to-work","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/6dof-udf-does-not-seem-to-work\/","title":{"rendered":"6DOF UDF does not seem to work"},"content":{"rendered":"<p>&lt;p&gt;Dear all,&nbsp;&lt;\/p&gt;&lt;p&gt;I would like to ask for help regarding the dynamic simulation of vortex-induced oscillation on a bridge deck as shown below.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/13-09-2024-1726213137-mceclip0.png\" width=\"708\" height=\"292\" \/>&lt;\/p&gt;&lt;p&gt;I use the 6DOF solver to calculate displacements of the bridge deck due to the aerodynamic forces and for that I&#8217;ve assigned the properties using a UDF with the DEFINE_SDOF_PROPERTIES function since I want to introduce damping to my model. For the UDF, I used codes shown in <a title=\"this video\" href=\"https:\/\/www.youtube.com\/watch?v=7MeHvOrXl8g&amp;t=522s\">https:\/\/www.youtube.com\/watch?v=7MeHvOrXl8g&amp;t=522s<\/a> as a reference with some modifications to fit with my case study. My UDF source code is outlined as follows:&lt;\/p&gt;&lt;p&gt;#include &#8220;udf.h&#8221;&lt;br&gt;#include &#8220;dynamesh_tools.h&#8221;&lt;\/p&gt;&lt;p&gt;FILE *fout;&lt;\/p&gt;&lt;p&gt;DEFINE_SDOF_PROPERTIES(bridge_motion_standard, prop, dt, time, dtime)&lt;br&gt;{&lt;br&gt;&nbsp; &nbsp; Thread *t;&lt;br&gt;&nbsp; &nbsp; Domain *d = Get_Domain(1);&lt;br&gt;&nbsp; &nbsp; \/*real x_cg[3], force[3], moment[3];*\/&lt;br&gt;&nbsp; &nbsp; real pos_x, pos_y, pos_theta;&lt;br&gt;&nbsp; &nbsp; real cg_x = 0; \/*center of gravity x*\/&lt;br&gt;&nbsp; &nbsp; real cg_y = -0.025; \/*center of gravity y*\/&lt;br&gt;&nbsp; &nbsp; real defo_x, defo_y, rot_z; \/*displacement variables*\/&lt;br&gt;&nbsp; &nbsp; real vel_x, vel_y, rot_vel; \/*velocity variable*\/&lt;br&gt;&nbsp; &nbsp; real Fx, Fy, Mz; \/*force*\/&lt;br&gt;&nbsp; &nbsp; real mass = 33.75; \/*bridge deck model*\/&lt;br&gt;&nbsp; &nbsp; real mom_inertia = 1.73; \/*moment inertia*\/&lt;br&gt;&nbsp; &nbsp; real fh = 9.5; \/*heave frequency in Hz*\/&lt;br&gt;&nbsp; &nbsp; real ft = 20.0; \/*torsion frequency in Hz*\/&lt;br&gt;&nbsp; &nbsp; real fd = 0.8*fh; \/*drag frequency in Hz*\/&lt;br&gt;&nbsp; &nbsp; \/*natural frequencies in rad\/s*\/&lt;br&gt;&nbsp; &nbsp; real wh = 2*M_PI*fh;&lt;br&gt;&nbsp; &nbsp; real wt = 2*M_PI*ft;&lt;br&gt;&nbsp; &nbsp; real wd = 2*M_PI*fd;&lt;br&gt;&nbsp; &nbsp; real zeta = 0.005; \/*damping ratio*\/&lt;br&gt;&nbsp; &nbsp; \/*stiffness calculation*\/&lt;br&gt;&nbsp; &nbsp; real kh = mass*wh*wh;&lt;br&gt;&nbsp; &nbsp; real kt = mom_inertia*wt*wt;&lt;br&gt;&nbsp; &nbsp; real kd = mass*wd*wd;&lt;br&gt;&nbsp; &nbsp; \/*damping coefficient calculation*\/&lt;br&gt;&nbsp; &nbsp; real ch = 2*mass*wh*zeta;&lt;br&gt;&nbsp; &nbsp; real ct = 2*mom_inertia*wt*zeta;&lt;br&gt;&nbsp; &nbsp; real cd = 2*mass*wd*zeta;&lt;br&gt;&nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; t = DT_THREAD(dt);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_MASS] = mass; \/* total mass:total length*\/&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_IZZ] = mom_inertia; \/*mass moment inertia*\/&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_ZERO_TRANS_X] = FALSE;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_ZERO_TRANS_Y] = FALSE;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_ZERO_TRANS_Z] = TRUE;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_ZERO_ROT_X] = TRUE;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_ZERO_ROT_Y] = TRUE;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_ZERO_ROT_Z] = FALSE;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; pos_x = (DT_CG(dt)[0]);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; pos_y = (DT_CG(dt)[1]);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; pos_theta = (DT_THETA(dt)[2]*M_PI\/180);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; \/*deformation calculation*\/&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; defo_x = pos_x &#8211; cg_x;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; defo_y = pos_y &#8211; cg_y;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; rot_z = pos_theta;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; vel_x = (DT_VEL_CG(dt)[0]);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; vel_y = (DT_VEL_CG(dt)[1]);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; rot_vel = (DT_OMEGA_CG(dt)[2]);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; \/*spring force and damping force calculation*\/&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_LOAD_F_X] = -kd*defo_x &#8211; cd*vel_x;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_LOAD_F_Y] = -kh*defo_y &#8211; ch*vel_y;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; prop[SDOF_LOAD_M_Z] = -kt*rot_z &#8211; ct*rot_vel;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; \/*results writing to txt files*\/&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fout = fopen(&#8220;displacement_results.txt&#8221;, &#8220;a&#8221;);&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fprintf(fout, &#8220;%g %f %f %f \\n&#8221;, time, defo_x, defo_y, rot_z);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fclose(fout);&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; &nbsp; &nbsp; fout = fopen(&#8220;velocity_results.txt&#8221;, &#8220;a&#8221;);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fprintf(fout, &#8220;%g %f %f %f \\n&#8221;, time, vel_x, vel_y, rot_vel);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fclose(fout);&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; &nbsp; &nbsp; fout = fopen(&#8220;acceleration_results.txt&#8221;, &#8220;a&#8221;);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fprintf(fout, &#8220;%g %f %f %f \\n&#8221;, time, DT_ACC_CG(dt)[0], DT_ACC_CG(dt)[1], DT_ALPHA_CG(dt)[2]);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; fclose(fout);&lt;br&gt;}&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I have tried compiling and hooking the UDF and there was no problem with that process, however the analysis results showed that the lift-forces and the displacements of the bridge deck increasing continuously instead of reaching a steady-state condition as predicted by other papers related to VIV on a bridge deck. It just seemed like the resistance forces from spring and damping did not exist. Does anybody have any idea what the problem is? I am afraid that FLUENT somehow was not able to read my UDF and it just ended up getting ignored by the program, but I am not sure.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-382576","topic","type-topic","status-publish","hentry","topic-tag-dynamic-mesh"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Dear all, I would like to ask for help regarding the dynamic simulation of vortex-induced oscillation on a bridge deck as shown below.I use the 6DOF solver to calculate displacements of the bridge deck due to the aerodynamic forces and for that I&#039;ve assigned the properties using a UDF with the DEFINE_SDOF_PROPERTIES function since I want\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/6dof-udf-does-not-seem-to-work\/\" \/>\n\t<meta name=\"generator\" content=\"All 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