In many industrial applications, some measurement instruments must be placed in a pipe in which fluid flows. Two phase cross flows around a body have seldom been studied until now and considering these flows can play a significant role in long-term reliability and safety of industrial systems. In this paper drag coefficient, pressure coefficient and void fraction around triangular bodies with different leading edge angles were considered. Also effect of Reynolds number and inlet void fraction on drag coefficient and pressure coefficient has been investigated and flow treatment behind the triangular obstacle has been examined. To achieve this aim, main equations of flow have been developed for investigation of drag coefficient in air-water two phase. Our numerical analyses were performed by a designed and written CFD package which is based on Eulerian-Eulerian approach. Geometries, which have been studied in this article, are triangle, with different leading edge angle. Other parameters such as two phase Reynolds number, free stream void fraction and bubble size were considered, too. Drag coefficient is closely relates to the turbulence and the bubble motion. Since these mechanisms vary over time, we used final value of drag coefficient after convergence. The results showed that drag coefficient is strongly depended of Reynolds number. In this simulation it can be seen that both the drag coefficient and pressure drag coefficient decrease whit increase in two phase Reynolds number and increase with decrease in inlet void fraction.

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