Abstract
It is necessary to establish the sound transmission analysis method in order to develop the hyper sonic type hydrogen gas flow meter. This method requires sound analyzing under the condition of flow with velocity distribution. We adopted FDTD method to solve this problem. FDTD method is one of the sound transmission analysis. We had FDTD program included a process to calculate movement of the particle in the gas using one dimensional difference. Then we compared the result of FDTD simulation with the experimental result and theoretical value, and estimated this FDTD program.
