what to care about when create your own case
Posted July 16, 2012 at 04:36 by Ahmed Khattab
Tags blockmesh, grading, time, write interval
when you create tour own case please take care of:
1- your mesh through editing blockMeshDict file
a- take care of factor of conversion to meter to get your dimensions right.
b- take care of the way you ordering points in hex deceleration because this order specifies direction of XYZ axis.
c- take care of number of cells in each direction because it specifies steps of calculation and plotting. ex: when you scope is the boundary layer variation make the step small by enlarge number o cells to enable notifying of values.
d- take care of grading value it enables you to reduce number of cells and change its width over direction in such way you can get small cells in scope area and larger ones in other domain areas.
e- take care of of number of cells you choose because total cells number affect running time of your solver by large way.
2- your time from controlDict file:
a- take care of end time and time steps, many solvers fails due to problem in adjusting time steps.
b- write interval. large values of write interval gives low time step recorded value for plotting values.
if this value is 1 or less you won't get values except zero values.
c- you can adjust end time during running solver. if you want to terminate it.
d- you can modify your start time to match last value recorded from previous running
of the solver.
1- your mesh through editing blockMeshDict file
a- take care of factor of conversion to meter to get your dimensions right.
b- take care of the way you ordering points in hex deceleration because this order specifies direction of XYZ axis.
c- take care of number of cells in each direction because it specifies steps of calculation and plotting. ex: when you scope is the boundary layer variation make the step small by enlarge number o cells to enable notifying of values.
d- take care of grading value it enables you to reduce number of cells and change its width over direction in such way you can get small cells in scope area and larger ones in other domain areas.
e- take care of of number of cells you choose because total cells number affect running time of your solver by large way.
2- your time from controlDict file:
a- take care of end time and time steps, many solvers fails due to problem in adjusting time steps.
b- write interval. large values of write interval gives low time step recorded value for plotting values.
number of recorded values = end time/ time step * write interval
if this value is 1 or less you won't get values except zero values.
c- you can adjust end time during running solver. if you want to terminate it.
d- you can modify your start time to match last value recorded from previous running
of the solver.
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