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time step choice for transient heat conduction problem of solid in convective flowfield
Lumped body in convective flowfield
Heat generation of lumpted body
Estimate the proper choice for dt for unsteady simulation
From a 0-D analysis,
time constant, tc = hA/(rho C Vol)
h = conv. h.t. coeff
rho = density of lump
C = heat capacity of lump
Vol = volume of lump
A = surface area.
Compute tc using above formula. Chose dt = 1/10 to 1/100 of tc.