TimeExplicit
Solve time-dependent problems with explicit time stepping.
Syntax
model.sol(sname).create(fname,"TimeExplicit")
model.sol(sname).feature(fname).set(pname,pvalue)
Description
 Operation feature. The TimeExplicit solver is used for solving time-dependent PDEs using the classic Runge-Kutta or the Adams-Bashforth 3 explicit time-stepping schemes
Table 6-69: Valid TimeExplicit Properties
Property
Values
Default
Description
clist
String array
 
Provide values for constants as input parameters using a string array; for the corresponding constant names, use cname.
cname
String array
 
Provide names of constants as input parameters using a string array; for the corresponding constant values, use clist.
control
String
user
Name of the controlling study step or "user" if the feature is controlled manually.
erkorder
integer between 1 and 4
4
Runge-Kutta order.
exprs
String
 
Expression for time stepping when tstepping=elemexprs.
keeplog
on | off
off
Keep warnings in stored log.
linsolver
 
 
Linear solver
message
String
 
The log message from the last solution process.
odesolver
erk | ab3 | ab3loc
erk
Time explicit solver.
plot
on | off
off
Plot while solving.
plotfreq
tsteps | tout
tout
Times to update plot.
plotgroup
String
 
Name of plot group for plot while solving.
probefreq
tsteps | tout
tsteps
Times to update probe.
probes
vector of strings
 
Probed to use if probesel=manual.
probesel
all | none | manual
all
The probes to compute.
rktimestep
positive scalar
1e-3
Time step.
solfile
on | off
on
Store solution out-of-core.
storeudot
on | off
on
Store time-derivatives.
tlist
vector of strings
 
Specified time list.
tout
tsteps | tlist
tlist
Times to store in solution.
tstepping
manual | elemexprs
manual
Manual or from expressions time stepping.
The order of the Runge-Kutta method can be set by the erkorder property. The size of the time step is controlled through the property rktimestep and can be given as a single scalar value, a (strictly monotone) numeric vector, or an expression using variables with global scope, which results in a scalar. For Adams-Bashforth 3 only a scalar constant value of the time step is allowed. Time stepping from expressions tstepping=elemexprs is useful for the Wave form PDE interface. A local time stepping version of Adams-Bashforth 3 is available for the Wave form PDE interface by odesolver=ab3loc.