[suihenry]

Hi, guys. i have a big problem in my simulation to analysis the fluid flow passing a check valve. i want to define a feedback control inlet condition of mass flow. At the end of each tStep, if the force caused by fluid flow is bigger than the spring force, the mass rate should be reduced; if the force caused by fluid flow is lower than the spring force, the mass rate should be increased. But how to do it? should i use the function of program like VB or C language? if so, are there some cases to study? Please help me. Thank you.