Learning Forum

[marwan abdelhamid]

1) if i want to change the value in a boundry condition (far-field-prssure) from 5deg AOA to 9 deg, do  need to intialize the solution or it would be faster to just change it and then continue solving.

2) if i want to make mesh dependence test in fluent how can i use the mesh i already made (a course mesh) as a starting point.

[Rob]

Assuming you're not in Workbench. You can continue a Fluent run having changed something in the solver. So if you change the far field vector just hit iterate once you've done it. You need to save the case & data files for later post processing though. 

Have a look at mesh refinement (adaption) and interpolation files. 

 

[marwan abdelhamid]

 

thanks rob, just final question, in the 1st & the 2nd question would i need to intialize and if so does that cancel what i did.

i mean if i changed the vector would the i need to start, or could i use the niterpolate files.

[Rob]

If you use the interpolation approach it's usually a good idea to initialise first, then read the interpolation file. That's more for changes in the domain or models as you may not have all the data you need in the interpolation file. 

If you just change the vector do NOT initialise and just hit iterate as normal: the cell data is already present. 

In both cases the residuals will spike and you may not see "good" convergence as the solution is very close to the starting value. Hence monitors & flux checks may be needed.