Ramps

On the Ramps tab a ramp for density, heat capacity or viscosity can be specified. This is useful when you start from scratch and it is not possible to obtain a solution with the real material properties.

e.g. the ramp starts with an increased viscosity and/or a decreased heat capacity and runs towards the final values.

Convection dialog, Ramps tab 

Figure 47. Convection dialog, Ramps tab

Item

Description

run a density ramp

If the check box is active, the ramp for the density is started, specified by the start factor density and multiply factor per step. The steps are defined by the values given in do steps at:.

run a capacity ramp

If the check box is active, the ramp for the heat capacity is started, specified by the start factor capacity and multiply factor per step. The steps are defined by the values given in do steps at:.

run a viscosity ramp

If the check box is active, the ramp for the viscosity is started, specified by the start factor viscosity and multiply factor per step. The steps are defined by the values given in do steps at:.

do steps at:

Ramp steps are performed when the norms are lower than the values given in momentum and temperature. To perform a ramp you must activate the appropriate check box and specify start and multiply factor.

Related Procedures

Setting ramp parameters