This paper presents a topology optimization (TO)-based design of a fluid diode that provides resistance to the flow in one direction but allows fluid flow in the opposite direction. These devices find applications in areas of micro-fluidics such as microelectronics, biotechnology, and instruments for chemical analysis. Motivated by the recent developments in the field of topology optimization for fluid flows we aim to reproduce the designs similar to already existing in the literature; and to search for a design shape which can function closer to an ideal fluid diode that can fully stop the flow in reverse direction. In this work we implemented the density-based optimality criteria algorithm. The optimization was performed in MATLAB code built on optimality criteria method and multiple strategies are utilized to obtain the desired solution. The problem was formulated as multi load case problem which requires to create a suitable expression for objective function. The design space was extensively explored by examining four boundary conditions on the domain, investigating the effect of ten non design domains, testing fixed and random initial designs and varying the input parameters within a range. Three outcomes are presented in this paper.