Answer:
Transient wind simulations play a crucial role in analyzing airflow patterns, turbulence, and aerodynamic forces in various engineering applications, such as structural analyses against wind load. Unlike steady-state simulations, transient simulations capture the time-dependent behavior of wind flow, requiring a careful balance between accuracy and computational efficiency.
One of the critical factors in transient wind simulations is determining the sufficient total simulation time to ensure reliable and meaningful results (Image 1). If the simulation time is too short, the flow may not fully develop, leading to inaccurate predictions of key parameters such as velocity, pressure fluctuations, and turbulence characteristics. Conversely, excessively long simulation times can result in unnecessary computational costs without significantly improving accuracy.
The stabilization of both the residuals and the overall drag force (and/or its components) needs to be monitored in transient simulation (Image 2).
By stabilization, obtaining a constant value or a periodic oscillation over time is recommended (Image 3). In case these criteria are not met, it is suggested that the transient calculation be continued, which can be easily done by the users.
