  Solar wind streams, acting as background, govern the propagation of space
weather drivers in the heliosphere, which induce geomagnetic storm activities.
Therefore, predictions of the solar wind parameters are the core of space
weather forecasts. This work presents an indigenous three-dimensional (3D)
Solar Wind model (SWASTi-SW). This numerical framework for forecasting the
ambient solar wind is based on a well-established scheme that uses a
semi-empirical coronal model and a physics-based inner heliospheric model. This
study demonstrates a more generalized version of Wang-Sheeley-Arge (WSA)
relation, which provides a speed profile input to the heliospheric domain.
Line-of-sight observations of GONG and HMI magnetograms are used as inputs for
the coronal model, which in turn, provides the solar wind plasma properties at
0.1 AU. These results are then used as an initial boundary condition for the
magnetohydrodynamics (MHD) model of the inner heliosphere to compute the solar
wind properties up to 2.1 AU. Along with the validation run for multiple
Carrington rotations, the effect of variation of specific heat ratio and study
of stream interaction region (SIR) is also presented. This work showcases the
multi-directional features of SIRs and provides synthetic measurements for
potential observations from the Solar Wind Ion Spectrometer (SWIS) subsystem of
Aditya Solar wind Particle EXperiment (ASPEX) payload on-board ISRO's upcoming
solar mission Aditya-L1.
