SIMULATION METHOD

• Main Authors: IDA ATSUMI, TSUGAWA YUMIKO
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2016
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PROBLEM TO BE SOLVED: To provide a simulation method which can improve the precision of calculation by setting advancing and receding contact angles at rest on the basis of judgment.SOLUTION: A simulation method for performing a simulation of two-phase flow of gas and liquid in a flow passage, includes: a step of defining the contact angle θ of a droplet L with respect to a solid wall W as a static receding contact angle θrs when the flow velocity vector of gas G coming into contact with the droplet L is in the same direction as the normal vector of the solid wall W to which the droplet L attaches, and defining the contact angle θ as a static advancing contact angle θas when the flow velocity vector of gas G coming into contact with the droplet L is in the opposite direction to the normal vector of the solid wall W; and a step of changing the contact angles θrs, θas to dynamic receding contact angles θrd, θad when the force which the droplet L receives from the gas G exceeds the adhesive force σx(cosθas-cosθrs) of the droplet L to the solid wall W, which is derived from the surface tension σ of the droplet L.SELECTED DRAWING: Figure 2 【課題】静止中の前後接触角を判断して設定することで、計算精度を高めることが可能なシミュレーション方法を提供する。【解決手段】流路内における気液二相流のシミュレーションを行うシミュレーション方法であって、液滴Ｌに接したガスＧの流速ベクトルが、液滴Ｌが付着する固体壁Ｗの法線ベクトルと同方向となる場合は、固体壁Ｗに対する液滴Ｌの接触角θを静止後退接触角θrsと定義し、液滴Ｌに接したガスＧの流速ベクトルが、固体壁Ｗの法線ベクトルと逆方向になる場合は接触角θを静止前進接触角θasと定義するステップと、液滴Ｌの表面張力をσとした場合、表面張力σから導かれる液滴Ｌの固体壁Ｗへの付着力σx(cosθas−cosθrs)に対し、液滴ＬがガスＧから受ける力が上回った場合に接触角θrs，θasを運動後退接触角θrd，θadに切り替えるステップとを有する。【選択図】図２