Loading docs/source/inputs/InputsProblemDefinition.rst +26 −0 Changes for docs/source/inputs/InputsProblemDefinition.rst: 26 added lines, 0 removed lines. Original line number Diff line number Diff line Loading @@ -649,6 +649,32 @@ Below is an example for specifying boundary conditions for a fluid `myfluid`. bc.outflow.myfluid.pressure = 0.0 Transient Boundary Conditions ----------------------------- Velocity, temperature, and pressure boundary conditions may also be specified as a function of time simply by adding a new column. The time value is entered in the new first column. We can make the `mi` boundary condition above time-dependent by replacing: .. code-block:: none bc.inflow.myfluid.velocity = 0.0 0.0 0.0 0.0 bc.inflow.myfluid.velocity = 3.0 0.015 0.0 0.0 bc.inflow.myfluid.temperature = 0.0 300 bc.inflow.myfluid.temperature = 2.99 300 bc.inflow.myfluid.temperature = 3.0 500 bc.inflow.myfluid.temperature = 4.0 500 bc.inflow.myfluid.temperature = 4.01 300 In the above example, the inflow velocity is accelerated from zero to its final value over a period of three seconds. Linear interpolation is used in between discrete time values and held constant at the last time value. The temperature sees an abrupt spike from 300 up to 500 at t = 3s and then back down again after 4s. Note that the timestep is not adjusted to sync with transient BCs. Boundary Conditions on Embedded Boundaries ------------------------------------------ Loading Loading
docs/source/inputs/InputsProblemDefinition.rst +26 −0 Changes for docs/source/inputs/InputsProblemDefinition.rst: 26 added lines, 0 removed lines. Original line number Diff line number Diff line Loading @@ -649,6 +649,32 @@ Below is an example for specifying boundary conditions for a fluid `myfluid`. bc.outflow.myfluid.pressure = 0.0 Transient Boundary Conditions ----------------------------- Velocity, temperature, and pressure boundary conditions may also be specified as a function of time simply by adding a new column. The time value is entered in the new first column. We can make the `mi` boundary condition above time-dependent by replacing: .. code-block:: none bc.inflow.myfluid.velocity = 0.0 0.0 0.0 0.0 bc.inflow.myfluid.velocity = 3.0 0.015 0.0 0.0 bc.inflow.myfluid.temperature = 0.0 300 bc.inflow.myfluid.temperature = 2.99 300 bc.inflow.myfluid.temperature = 3.0 500 bc.inflow.myfluid.temperature = 4.0 500 bc.inflow.myfluid.temperature = 4.01 300 In the above example, the inflow velocity is accelerated from zero to its final value over a period of three seconds. Linear interpolation is used in between discrete time values and held constant at the last time value. The temperature sees an abrupt spike from 300 up to 500 at t = 3s and then back down again after 4s. Note that the timestep is not adjusted to sync with transient BCs. Boundary Conditions on Embedded Boundaries ------------------------------------------ Loading
