Outlet Pressureflow coupled boundary condition (Windkessel)
Hi,
I'm trying to apply a windkessel type boundary condition at the outlet, which is of the form: P(t) + k*P'(t) = Q(t), where k is a known constant To do this, I model the outlet as a 'pressureoutlet' and use a UDF to impose P(t) on the outlet faces. To calculate P(t), I approximate P'(t) by [P(t)  P(t1)]/delta_t, and arrive at the closed form expression P(t) = Function[P(t1), Q(t), k, delta_t] My question is: how do I specify this equation in the UDF ? At present, I'm using the DEFINE_PROFILE(pressure, t, i) macro, calculating Q(t) by Code:
density = 100; Is there a macro like F_P_M1(f,t) ? 
I am also facing the same problem. Does anyone has answer for this. Also since Q is evaluated at current time step. I need to iterate to get p. How should I do the iteration using UDF?
Thanks a lot 
I'm also stuck on this. I made UDM for storing P(t1) and initialised it. So, it should work but in the results, I see that the compliance phenomenon isn't observed. I've modelled wall material as elastic. Does it need to be hyperelastic or something to get FSI coupling behavior?

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