METHOD FOR SIMULATING GAS-LIQUID TWO-PHASE FLOW
PROBLEM TO BE SOLVED: To improve simulation accuracy in simulating the behavior of a gas-liquid two-phase flow when droplets sticking to a solid wall are subjected to an external force from a gas and the contact angle of droplets relative to the solid wall changes.SOLUTION: Provided is a method for...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To improve simulation accuracy in simulating the behavior of a gas-liquid two-phase flow when droplets sticking to a solid wall are subjected to an external force from a gas and the contact angle of droplets relative to the solid wall changes.SOLUTION: Provided is a method for simulating a gas-liquid two-phase flow, including the steps of: setting the initial contact angle relative to a solid phase of a liquid phase sticking to the solid phase; calculating an interface speed using the initial contact angle; calculating the occasional contact angle relative to the solid phase of the liquid phase using as a function of an interface speed that satisfies a prescribed condition; and determining that calculations have converged when a difference between the initial contact angle and the occasional contact angle is less than or equal to a threshold. The prescribed condition is that at the time of forward interface movement, the occasional contact angle increases in a range of first critical angle or less when the liquid phase starts moving, that at the time of backward interface movement, the occasional contact angle decreases in a range of second critical angle or less when the liquid phase starts moving, and that the occasional contact angle does not change from the initial contact angle when the interface speed is 0.SELECTED DRAWING: Figure 3
【課題】、固体壁に付着した液滴が気体から外力を受け、液滴の固体壁に対する接触角が変化する場合の気液二相流の挙動のシミュレーションにおいて、シミュレーション精度を向上する。【解決手段】気液二相流のシミュレーション方法であって、固相に付着する液相の、固相に対する初期接触角を設定するステップと、初期接触角を用いて、界面速度を算出するステップと、固相に対する液相の随時接触角を、所定の条件を満たす、界面速度の関数として算出するステップと、初期接触角と随時接触角との差が閾値以下の場合、計算が収束したと判定するステップと、を有する。所定の条件は、界面の前進時、随時接触角は、液相が移動を開始するときの第1臨界角以下の範囲で増加し、界面の後退時、随時接触角は、液相が移動を開始するときの第2臨界角以上の範囲で減少し、界面速度が0では、随時接触角は初期接触角から変化しない、との条件である。【選択図】図3 |
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