|February 17, 2014, 10:44||
OpenFOAM crashes using high resolution grid at wall
Join Date: Jun 2012
Location: Germany, Bochum
Posts: 124Rep Power: 7
I am really new to OpenFOAM, and after going through some of the tutorials I found the simpleFoam/turbineSiting tutorial which helped me to create a simulation with an atmospheric boundary layer (ABL).
For my own test simulation I wanna start with an empty domain with an ABL just going through it. This works fine for an uniform mesh of 0.1m in a 1.6x1.8x12m domain.
For my further studies it is necessary to have a high mesh resolution of the boundary layer at the bottom of the domain. So, I tried to put the node of the first cell at the bottom at about y+ = 30 which should be above the buffer layer to use wall functions for the viscous layer at the wall.
In my case I considered the freestream velocity as 6m/s, and the boundary length as 1.2m which gave me - using the cfd-online tool - a y+=30 wall distance of 0.0016m. However, when I make the mesh this dense at the bottom of my domain the simulation crashes in OpenFoam. Here is the errorcode if that helps:
nutkWallfunction for the walls
kqRWallFunction for k
epsilonWallFunction for eps
no-slip condition for U
zeroGradient for p
I also changed the inlet conditions of the ABL using Uref= 4 m/s, Href = 0,25m.
I am thankful for any comments regarding my thoughts about the simulations or hints why my denser mesh doesn't work.
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