In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff a...In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff and landing aircraft(eVTOL).The aircraft model has four pairs of coaxial propellers,and the computational domain is divided into three domains to move the aircraft and eight propeller domains to rotate the propellers.As a result,we clarify the behavior and aerodynamic force of the aircraft when the input values are determined by the automatic control.The results in the flow field also show that the downwash spreads in a crisscross pattern on the ground,the wind reaches different ranges on the ground depending on the flight altitude,and that the coaxial propeller causes an asymmetry in the velocity field during yawing.Conse-quently,we conclude that this method is effective for the flight simulation of an eVTOL.展开更多
This study proposes a method for modelling the flow interaction of multiple moving objects where the flow field variables are communicated between multiple separate moving computational domains.Instead of using the co...This study proposes a method for modelling the flow interaction of multiple moving objects where the flow field variables are communicated between multiple separate moving computational domains.Instead of using the conventional approach with a single fixed computational domain covering the whole flow field,this method advances the moving computational domain(MCD)method in which the computational domain itself moves in line with the motions of an object inside.The computational domains created around each object move independently,and the flow fields of each domain interact where the flows cross.This eliminates the spatial restriction for simulating multiple moving objects.Firstly,a shock tube test verifies that the overset implementation and grid movement do not adversely affect the results and that there is communication between the grids.A second test case is conducted in which two spheres are crossed,and the forces exerted on one object due to the other’s crossing at a short distance are calculated.The results verify the reliability of this method and show that it is applicable to the flow interaction of multiple moving objects.展开更多
基金JKA through its promotion funds from KEIRIN RACE and by JSPS KAKENHI Grant Number 21K03856.
文摘In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff and landing aircraft(eVTOL).The aircraft model has four pairs of coaxial propellers,and the computational domain is divided into three domains to move the aircraft and eight propeller domains to rotate the propellers.As a result,we clarify the behavior and aerodynamic force of the aircraft when the input values are determined by the automatic control.The results in the flow field also show that the downwash spreads in a crisscross pattern on the ground,the wind reaches different ranges on the ground depending on the flight altitude,and that the coaxial propeller causes an asymmetry in the velocity field during yawing.Conse-quently,we conclude that this method is effective for the flight simulation of an eVTOL.
基金JKA through its promotion funds from KEIRIN RACE and by JSPS KAKENHI Grant Number 21K03856.
文摘This study proposes a method for modelling the flow interaction of multiple moving objects where the flow field variables are communicated between multiple separate moving computational domains.Instead of using the conventional approach with a single fixed computational domain covering the whole flow field,this method advances the moving computational domain(MCD)method in which the computational domain itself moves in line with the motions of an object inside.The computational domains created around each object move independently,and the flow fields of each domain interact where the flows cross.This eliminates the spatial restriction for simulating multiple moving objects.Firstly,a shock tube test verifies that the overset implementation and grid movement do not adversely affect the results and that there is communication between the grids.A second test case is conducted in which two spheres are crossed,and the forces exerted on one object due to the other’s crossing at a short distance are calculated.The results verify the reliability of this method and show that it is applicable to the flow interaction of multiple moving objects.
