sunfluidh:gravity_namelist
Différences
Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédente | ||
sunfluidh:gravity_namelist [2017/07/03 18:17] – yann | sunfluidh:gravity_namelist [2019/08/01 09:27] (Version actuelle) – yann | ||
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Ligne 24: | Ligne 24: | ||
==== Gravity_Angle_IK ==== | ==== Gravity_Angle_IK ==== | ||
* Type : real value | * Type : real value | ||
- | * angle between the K-axis and $-\vec{G}$ | + | * angle between the K-axis and $-\vec{G}$ (in degrees). The K-axis is the origin axis. |
* Default value = 0.0 | * Default value = 0.0 | ||
==== Reference_Gravity_Constant ==== | ==== Reference_Gravity_Constant ==== | ||
Ligne 36: | Ligne 36: | ||
<WRAP important> | <WRAP important> | ||
- | The orientation of the gravity vector $\vec{g}$ in the cartesian referential $(\vec{I}, | + | The orientation of the gravity vector $\vec{g}$ in the cartesian referential $(\vec{I}, |
- | $$G_I=-G_0.cos(\text{Gravity_Angle_IJ}).sin(\text{Gravity_Angle_IK})$$ | + | $$G_I= -G_0.cos(\text{Gravity_Angle_IJ}).sin(\text{Gravity_Angle_IK})$$ |
- | $$G_J=-G_0.sin(\text{Gravity_Angle_IJ}).sin(\text{Gravity_Angle_IK})$$ | + | $$G_J= -G_0.sin(\text{Gravity_Angle_IJ}).sin(\text{Gravity_Angle_IK})$$ |
- | $$G_K=-G_0.cos(\text{Gravity_Angle_IK})$$ | + | $$G_K= -G_0.cos(\text{Gravity_Angle_IK})$$ |
Where $G_0$ is norm of the force of gravity (or the buoyancy force).\\ | Where $G_0$ is norm of the force of gravity (or the buoyancy force).\\ | ||
+ | \\ | ||
+ | __Remarks__ | ||
+ | * The angle ranges are $ -90 \le $ Gravity_Angle_IJ $ \le +90$ and $ 0 \le $ Gravity_Angle_IK $ \le +180$. \\ | ||
+ | * From the definition of angles, note that the vector $\vec{g}$ is oriented along the $-\vec{K}$ axis while Gravity_Angle_IK= 0 and $\vec{g}$ is in the plan IJ while Gravity_Angle_IK= 90.\\ | ||
+ | |||
Following the type of simulation and the choice on the form of equations (dimensional, | Following the type of simulation and the choice on the form of equations (dimensional, | ||
$$F_b= (\rho - \rho_0).g_0$$ | $$F_b= (\rho - \rho_0).g_0$$ | ||
Ligne 51: | Ligne 56: | ||
in the momentum equations for incompressible flows under Boussinesq hypothesis. In this case | in the momentum equations for incompressible flows under Boussinesq hypothesis. In this case | ||
* $G_0= \beta.g_0$ where $\beta$ is the thermal expansion coefficient of the fluid considered. | * $G_0= \beta.g_0$ where $\beta$ is the thermal expansion coefficient of the fluid considered. | ||
- | * $T_0$ is the reference temperature defined in the namelist [[sunfluidh: | + | * $T_0$ is the reference temperature defined in the namelist [[sunfluidh: |
As a consequence the generalized form of $G_0$ in the code is : | As a consequence the generalized form of $G_0$ in the code is : | ||
$$G_0= \beta.g_0$$ | $$G_0= \beta.g_0$$ |
sunfluidh/gravity_namelist.1499098664.txt.gz · Dernière modification : 2017/07/03 18:17 de yann