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I was wondering if there's a way to set up angular velocity as an inlet boundary condition? For example when trying to model the natural rotational component of cardiac flow through the aortic valve, do I edit parameters in the "initial velocities" section in the simulation sidebar?

My understanding is that the parameters in "initial velocities" are for x, y, z, components of velocity, and my inlet flow file can only dictate the flow rate for my boundary condition.

You can try to modify bct.dat to set up velocity components for each inlet node.
The first line in bct.dat tells you how many nodes on inlet faces.
Starting from the second line, for each node i, nodal coordinates, velocity components and time are listed as follows,
x_i, y_i, z_i, n
u1_i, v1_i, w1_i, t1
u2_i,v2_i,w2_i,t2
....
un_i,vn_i,wn_i,tn
where n is the number of time points in a cardiac cycle, say n=100.

Thanks for responding Weiguang,

So would the workflow for this look something like:
Open bct.vtp in Paraview > Identify node IDs > manually calculate u / v / w components for the angular velocity for each node >write to bct.dat file?

For very dense meshes, this method would probably become very tedious very quickly..

Rohan