SIwave does not include the physical dimensions of the components (R,L,C) into the simulation because they are not needed since the component values and/or its parasitics (mounting inductance/resistance etc.) are already specified in the model. You can visually see the a 3D representative view of R,L and C components in your board by unchecking the "2D View" and "Simplyfy Circuit Elements" options under the view tab. However, these are only visual and does not affect simulation results. DCIR is intended to check the board elements such as planes, pads, traces, vias etc.
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