Remove more unnecessary defaults

Author: ChrisRackauckas

src/Magnetic/FluxTubes/utils.jl

@@ -30,8 +30,8 @@ Partial component with magnetic potential difference between two magnetic ports
         port_n = NegativeMagneticPort()
     end
     @variables begin
-        V_m(t) = 0.0
-        Phi(t) = 0.0
+        V_m(t)
+        Phi(t)
     end
     @equations begin
         V_m ~ port_p.V_m - port_n.V_m

src/Mechanical/Translational/components.jl

@@ -12,7 +12,7 @@ Use to close a system that has un-connected `MechanicalPort`'s where the force s
         flange = MechanicalPort()
     end
     @variables begin
-        f(t) = 0.0
+        f(t)
     end
     @equations begin
         flange.f ~ f

src/Mechanical/Translational/utils.jl

@@ -1,6 +1,6 @@
 @connector MechanicalPort begin
-    v(t) = 0.0
-    f(t) = 0.0, [connect = Flow]
+    v(t)
+    f(t), [connect = Flow]
 end
 Base.@doc """
     MechanicalPort(;name)

src/Mechanical/TranslationalPosition/components.jl

@@ -48,9 +48,9 @@ Sliding mass with inertia
         m
     end
     @variables begin
-        s(t) = 0.0
-        v(t) = 0.0
-        f(t) = 0.0
+        s(t)
+        v(t)
+        f(t)
     end
     @components begin
         flange = Flange(; s = s)
@@ -164,8 +164,8 @@ Linear 1D translational damper
         d
     end
     @variables begin
-        va(t) = 0.0
-        vb(t) = 0.0
+        va(t)
+        vb(t)
         f(t) = +(va - vb) * d
     end
 

src/Mechanical/TranslationalPosition/utils.jl

@@ -136,7 +136,7 @@ Partial model for a component with two translational 1-dim. flanges and a suppor
     @named flange_a = Flange()
     @named flange_b = Flange()
     sys = [flange_a, flange_b]
-    @variables s_support(t) = 0.0
+    @variables s_support(t)
     if use_support
         @named support = Support()
         eqs = [support.s ~ s_support

src/Thermal/HeatTransfer/ideal_components.jl

@@ -25,7 +25,7 @@ Lumped thermal element storing heat
     end
     @variables begin
         T(t) = 273.15 + 20
-        der_T(t) = 0.0
+        der_T(t)
     end
 
     @equations begin

src/Thermal/utils.jl

@@ -35,8 +35,8 @@ flow rate through the element from `port_a` to `port_b`, `Q_flow`.
         port_b = HeatPort()
     end
     @variables begin
-        dT(t) = 0.0
-        Q_flow(t) = 0.0
+        dT(t)
+        Q_flow(t)
     end
     @equations begin
         dT ~ port_a.T - port_b.T
@@ -69,8 +69,8 @@ flow rate through the element from `solid` to `fluid`, `Q_flow`.
         fluid = HeatPort()
     end
     @variables begin
-        dT(t) = 0.0
-        Q_flow(t) = 0.0
+        dT(t)
+        Q_flow(t)
     end
     @equations begin
         dT ~ solid.T - fluid.T