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Almost every computational fluid dynamics problem is defined under the limits of initial and boundary conditions. For implementation of boundary conditions when we construct a staggered grid we add an extra node across the physical boundary in order to get, *The nodes just outside the inlet of the system are used to assign the inlet conditions *The physical boundaries can coincide with the scalar control volume boundaries. This allow us to introduce the boundary conditions and achieve discretion equations for nodes near boundary with small modifications. Most common boundary conditions used in computational fluid dynamics are *Intake conditions *Symmetry conditions *Physical boundary conditions *Cyclic conditions *pressure conditions *exit conditions ==Intake boundary conditions== We are considering the case of an inlet perpendicular to the x-direction - *For the first u, v, φ-cell all links to neighboring nodes are active, so there is no need of any modifications to discretion equations. *At one of the inlet node absolute pressure is fixed and made pressure correction to zero at that node. *Generally computational fluid dynamics codes estimate k and ε with approximate formulate based on turbulent intensity between 1 and 6% and length scale 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boundary conditions in CFD」の詳細全文を読む スポンサード リンク
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