# Convert transient case to steady state case

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 July 29, 2021, 04:44 Convert transient case to steady state case #1 New Member   Join Date: Jul 2021 Posts: 2 Rep Power: 0 Hello, I'm working on simulating kinematics of insect wing flapping and I wrote a UDF for its transient kinematics which works fairly well. The problem is that I need to actually rework the simulation as a steady state case for my final results. My current code has a time component which does not get processed by Fluent as the case is steady state, as you may see below: /* flap.c */ /* UDF for specifying a simple harmonic motion*/ /* */ /**********************************************/ #include "udf.h" #define Freq 0.1 #define angular_freq 2.0*M_PI*Freq #define tetmax -45.0*M_PI/180 DEFINE_CG_MOTION(shm, dt, cg_vel, cg_omega, time, dtime) { real omega; omega = tetmax*angular_freq*cos(angular_freq*time); /* rotational speed about axis*/ cg_vel[0] = 0.0075 * sin(3.1415927 * time / 5.); cg_vel[1] = 0.0; cg_vel[2] = 0.0; cg_omega[0] = 0.0; cg_omega[1] = 0.0; cg_omega[2] = omega; } I need to know how I can change this code so it works in a steady state case as well.

 July 29, 2021, 05:41 #2 Senior Member   Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34 motion itself implies something transient, isn't it? if you need steady state simulation on specific configuration of domain, you may : 1. prepare this mesh from the very beginning and run it as steady state 2. or stop your transient simulation at specific moment probably you have special knd of problem, which I don't fully understand __________________ best regards ****************************** press LIKE if this message was helpful

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