Loading docs/source_docs/references/fluids/FluidEquations.rst +1 −4 Original line number Diff line number Diff line Loading @@ -60,7 +60,7 @@ flows), only buoyancy (pressure gradient) and steady drag are considered: where :math:`\boldsymbol{V}_{ig} = \boldsymbol{V}_i - \boldsymbol{U}_g ( \boldsymbol{X}_i )` is the velocity of ith particle relative to the fluid-phase (at the particle position :math:`\boldsymbol{X}_i`). :math:`F_{gi}` is closed by the specification of a drag coefficient, :math:`C_D`. Currently, MFIX-Exa includes Wen-Yu, Gidaspow and BVK2 drag laws. coefficient, :math:`C_D`. Currently, MFIX-Exa includes Wen-Yu, Gidaspow, BVK2, and Syamlal-O'Brien drag laws. .. wdf todo gidaspow form: C_D^{Gidaspow} = \chi C_D^{(Wen-Yu)} + \left(1 - \chi \right) C_D^{(Ergun)} Loading @@ -78,6 +78,3 @@ the fluid momentum takes the more convenient form: .. math:: \frac{ \partial (\varepsilon_g \rho_g U_g)}{\partial t} + \nabla \cdot (\varepsilon_g \rho_g U_g U_g) + \varepsilon_g \nabla p_g = \nabla \cdot \tau + \sum_p \beta_p (V_p - U_g) + \varepsilon_g \rho_g g docs/source_docs/user_guide/inputs/model_options.rst +1 −1 Original line number Diff line number Diff line Loading @@ -318,7 +318,7 @@ The following input is defined using the prefix ``mfix.drag``: | | * ``WenYu`` :cite:p:`Wen66` | | | | | * ``Gidaspow`` :cite:p:`ding90,Lat00` | | | | | * ``BVK2`` :cite:p:`Bee07,Bee071,tenneti11,tang15` | | | | | * ``SyamOBrien`` :cite:p:`syam88` | | | | | * ``SyamOBrien`` -- Syamlal-O'Brien :cite:p:`syam88` | | | | | * ``UserDrag`` | | | | | | | | +--------------------------+-------------------------------------------------------------------------------+-------------+-----------+ Loading docs/source_docs/user_guide/inputs/porous_media.rst +1 −1 Original line number Diff line number Diff line Loading @@ -3,7 +3,7 @@ Porous media definitions ======================== Homogeneous porous media are modeled by the addition of a momentum Homogeneous porous media are modeled by the introduction of a momentum source term, :math:`\boldsymbol{S}_{pm}`, to the fluid momentum equation. .. math:: Loading docs/source_docs/user_guide/inputs/time_stepping.rst +8 −8 Original line number Diff line number Diff line Loading @@ -95,11 +95,11 @@ The following inputs are defined using the prefix ``mfix``: +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | Key | Description | Type | Default | +======================+=======================================================================+=============+==============+ | max_step | Maximum number of time steps to take | Int | -1 | | max_step | Maximum number of time steps to take. | Int | -1 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | stop_time | Maximum time to reach (s) | Real | -1.0 | | stop_time | Maximum time to reach (s). | Real | -1.0 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | fixed_dt | Use a fixed time step | Int | 0 | | fixed_dt | If > 0, use a fixed time step. | Real | 0 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | cfl | CFL constraint (dt < cfl * dx / u) | Real | See note | | | | | | Loading @@ -107,16 +107,16 @@ The following inputs are defined using the prefix ``mfix``: | | * Defaults to 0.9 if ``mfix.advection_type = Godunov`` | | | | | * ignored if ``mfix.fixed_dt = 1`` | | | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | dt_min | Abort if ``dt`` gets smaller than this value | Real | 1.e-6 | | dt_min | Abort if ``dt`` gets smaller than this value. | Real | 1.e-6 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | dt_max | Maximum value of ``dt`` if ``fixed_dt`` is not set | Real | 1.e14 | | dt_max | Maximum value of ``dt`` if ``fixed_dt`` is not set. | Real | 1.e14 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | tcoll_ratio | DEM time step equals the min collision time divided by this value | Real | 50.0 | | tcoll_ratio | DEM time step equals the min collision time divided by this value. | Real | 50.0 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | walltime_limit | Runtime limit specified with format HH:MM:SS. When the runtime has | String | "" | | | almost reached the limit (approaching is computed by considering the | | | | | average runtime needed for each step), then the simulation ends and | | | | | a clean exit is performed | | | | | a clean exit is performed. | | | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | clean_exit | The name of a file that, if found in the run | String | "" | | | folder, makes the solver stop and perform a clean exit. | | | Loading @@ -136,5 +136,5 @@ The following inputs are defined using the prefix ``mfix`` and are only relevant | steady_state_tol | Tolerance for checking if steady state has been reached. | Real | None | | | (Must be set if steady_state is enabled) | | | +-----------------------+-----------------------------------------------------------------------+-------------+------------+ | steady_state_maxiter | Maximum number of allowed iterations to converge to steady state | Int | 100000000 | | steady_state_maxiter | Maximum number of allowed iterations to converge to steady state. | Int | 100000000 | +-----------------------+-----------------------------------------------------------------------+-------------+------------+ Loading
docs/source_docs/references/fluids/FluidEquations.rst +1 −4 Original line number Diff line number Diff line Loading @@ -60,7 +60,7 @@ flows), only buoyancy (pressure gradient) and steady drag are considered: where :math:`\boldsymbol{V}_{ig} = \boldsymbol{V}_i - \boldsymbol{U}_g ( \boldsymbol{X}_i )` is the velocity of ith particle relative to the fluid-phase (at the particle position :math:`\boldsymbol{X}_i`). :math:`F_{gi}` is closed by the specification of a drag coefficient, :math:`C_D`. Currently, MFIX-Exa includes Wen-Yu, Gidaspow and BVK2 drag laws. coefficient, :math:`C_D`. Currently, MFIX-Exa includes Wen-Yu, Gidaspow, BVK2, and Syamlal-O'Brien drag laws. .. wdf todo gidaspow form: C_D^{Gidaspow} = \chi C_D^{(Wen-Yu)} + \left(1 - \chi \right) C_D^{(Ergun)} Loading @@ -78,6 +78,3 @@ the fluid momentum takes the more convenient form: .. math:: \frac{ \partial (\varepsilon_g \rho_g U_g)}{\partial t} + \nabla \cdot (\varepsilon_g \rho_g U_g U_g) + \varepsilon_g \nabla p_g = \nabla \cdot \tau + \sum_p \beta_p (V_p - U_g) + \varepsilon_g \rho_g g
docs/source_docs/user_guide/inputs/model_options.rst +1 −1 Original line number Diff line number Diff line Loading @@ -318,7 +318,7 @@ The following input is defined using the prefix ``mfix.drag``: | | * ``WenYu`` :cite:p:`Wen66` | | | | | * ``Gidaspow`` :cite:p:`ding90,Lat00` | | | | | * ``BVK2`` :cite:p:`Bee07,Bee071,tenneti11,tang15` | | | | | * ``SyamOBrien`` :cite:p:`syam88` | | | | | * ``SyamOBrien`` -- Syamlal-O'Brien :cite:p:`syam88` | | | | | * ``UserDrag`` | | | | | | | | +--------------------------+-------------------------------------------------------------------------------+-------------+-----------+ Loading
docs/source_docs/user_guide/inputs/porous_media.rst +1 −1 Original line number Diff line number Diff line Loading @@ -3,7 +3,7 @@ Porous media definitions ======================== Homogeneous porous media are modeled by the addition of a momentum Homogeneous porous media are modeled by the introduction of a momentum source term, :math:`\boldsymbol{S}_{pm}`, to the fluid momentum equation. .. math:: Loading
docs/source_docs/user_guide/inputs/time_stepping.rst +8 −8 Original line number Diff line number Diff line Loading @@ -95,11 +95,11 @@ The following inputs are defined using the prefix ``mfix``: +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | Key | Description | Type | Default | +======================+=======================================================================+=============+==============+ | max_step | Maximum number of time steps to take | Int | -1 | | max_step | Maximum number of time steps to take. | Int | -1 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | stop_time | Maximum time to reach (s) | Real | -1.0 | | stop_time | Maximum time to reach (s). | Real | -1.0 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | fixed_dt | Use a fixed time step | Int | 0 | | fixed_dt | If > 0, use a fixed time step. | Real | 0 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | cfl | CFL constraint (dt < cfl * dx / u) | Real | See note | | | | | | Loading @@ -107,16 +107,16 @@ The following inputs are defined using the prefix ``mfix``: | | * Defaults to 0.9 if ``mfix.advection_type = Godunov`` | | | | | * ignored if ``mfix.fixed_dt = 1`` | | | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | dt_min | Abort if ``dt`` gets smaller than this value | Real | 1.e-6 | | dt_min | Abort if ``dt`` gets smaller than this value. | Real | 1.e-6 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | dt_max | Maximum value of ``dt`` if ``fixed_dt`` is not set | Real | 1.e14 | | dt_max | Maximum value of ``dt`` if ``fixed_dt`` is not set. | Real | 1.e14 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | tcoll_ratio | DEM time step equals the min collision time divided by this value | Real | 50.0 | | tcoll_ratio | DEM time step equals the min collision time divided by this value. | Real | 50.0 | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | walltime_limit | Runtime limit specified with format HH:MM:SS. When the runtime has | String | "" | | | almost reached the limit (approaching is computed by considering the | | | | | average runtime needed for each step), then the simulation ends and | | | | | a clean exit is performed | | | | | a clean exit is performed. | | | +----------------------+-----------------------------------------------------------------------+-------------+--------------+ | clean_exit | The name of a file that, if found in the run | String | "" | | | folder, makes the solver stop and perform a clean exit. | | | Loading @@ -136,5 +136,5 @@ The following inputs are defined using the prefix ``mfix`` and are only relevant | steady_state_tol | Tolerance for checking if steady state has been reached. | Real | None | | | (Must be set if steady_state is enabled) | | | +-----------------------+-----------------------------------------------------------------------+-------------+------------+ | steady_state_maxiter | Maximum number of allowed iterations to converge to steady state | Int | 100000000 | | steady_state_maxiter | Maximum number of allowed iterations to converge to steady state. | Int | 100000000 | +-----------------------+-----------------------------------------------------------------------+-------------+------------+
