Main Help → All Commands → MPM Thermal Calculations → Conduction
The Conduction
command activates thermal conductivity calculations and also activates various optionals involving heat flow in the simulations or other mechanisms that cause temperature changes. These settings can change and select the thermodynamics mode of the simulation.
Conduction (isOn),<(option1)>,<(option2)>,...
where
(isOn)
is "Yes" or "No" to include or to not include thermal conductivity calculations in the MPM analysis.
The optional parameters #2 etc. can activate various physical mechanisms as heat sources that may cause temperature rises and may change the thermodynamics of the analysis. The options are
"Adiabatic"
(used to be "Mechanical energy"
, which is still allowed) to be locally adiabatic, which means any dissipated energy in a material results in a heat source that causes a temperature rise. This option can be used with conduction on or off. If conduction is off, the particle temperature will rise and will remain on the particle. When conduction is on, the heat may transfer to neighboring particles meaning with time, the particle will not be locally adiabatic. The entire problem, however, will be globally adiabatic unless there are thermal boundary conditions."Isothermal"
to be locally isothermal, which means the material response will never cause a temperature rise. Implicitly all dissipated energy is expelled to the exterior. The problem will be globally isothermal unless there are thermal boundary conditions."Crack tips"
to have cracks convert total energy released into heat at the crack tips. For crack-tip heating to work correctly, you have to set the crack thickness to define its thickness. This option has no affect unless #1 is "Yes." (i.e., the temperature rises results for heat source term in the conduction equations)."Friction"
to convert work of frictional sliding between materials in multimaterial mode into heat."Crack Friction"
to convert work of frictional sliding between crack surfaces into heat."Isothermal"
. Use the "Adiabatic"
option to switch to locally adiabatic instead. If both are listed, the last one listed will be the result.
"Adiabatic"
option is used, you must provide heat capacity for all materials used in the analysis to have realistic heat energy calculations. If conduction is on, you must also define thermal conductivity properties of materials used in the analysis.Conduction
command is only allowed for MPM analyses.