Method to simulate transient pressure behaviors in subsea natural gas pipelines with a moving smart isolation device

•A coupled dynamic mesh method is developed to simulate transient pressures in subsea maintaining gas pipelines with a moving smart isolation device.•The proposed method is able to be coupled with the MOC, making it have the ability to incorporate affecting parameters and then handle complicated conditions.•An experimental system has been conducted, and the proposed model has been validated using the experimental results to be accurate enough to simulate the transient pressures in gas pipelines with a moving object.