  Many prominences are supported by magnetic flux ropes. One important question
is how we can determine whether the flux rope is weakly-twisted or
strongly-twisted. In this paper, we attempted to check whether prominences
supported by weakly-twisted and strongly-twisted flux ropes can manifest
different features so that we might distinguish the two types of magnetic
structures by their appearance. We performed pseudo three-dimensional
simulations of two magnetic flux ropes with different twists. We found that the
resulting two prominences differ in many aspects. The prominence supported by a
weakly-twisted flux rope is composed mainly of transient threads, forming
high-speed flows inside the prominence. Its horns are evident. Conversely, the
one supported by a highly-twisted flux rope consists mainly of stable
quasi-stationary threads, including longer independently trapped threads and
shorter magnetically connected threads. It is also revealed that the prominence
spine deviates from the flux rope axis in the vertical direction and from the
photospheric polarity inversion line projected on the solar surface, especially
for the weakly-twisted magnetic flux rope. The two types of prominences differ
significantly in appearance. It is also suggested that a piling-up of short
threads in highly-twisted flux ropes might account for the vertical-like
threads in some prominences.
