You only need to add the according line to your. Without knowing the actual error, the issue is probably related to this. I assume you are rather looking for something like the include-function for y+ to obtain a y+ field. There was also collapse of the geometry all around so overall, it's under resolved and the AMI is too close. You can fix this by moving your AMI away from the blade tip. The time-step is variable, and the compressible Courant number is. Your small cells at the tip of your blades are a problem for Courant number since now you have small cells at the fastest moving part of your mesh. (OpenFOAM is installed with an opensource post-processing tool - paraview). I'd fit at least 3 cells in there and that is a level 8 or 9 just there. You have a space of about 0.0093m from your blade tip to your ami. For this reason the simulation time for the cases with the. The purpose was to avoid nonphysical pressure peaks which occurred for higher Co max. One of your groups of triangular faces around trailing edge of the blade is 0.0221 m (should be around a level 6 but it's set to level 2 or 3) but you'd probably want to go to a level 8 for good measure. For increasing frequency however, the maximum Courant number Co max had to be decreased from 0.75 for f c 0.16 to Co max 0.5 for f c 0.3 and Co max 0.25 for f c 0.66 for the morphing mesh. Your background mesh is 1m and your level on the rotor is 0.25m(level 2) and AMI is around 0.125m (level 3). The resolution of the mesh is not very good. ![]() See below the link to a OneDrive with the case and blender files for the turbine: The blockMesh is far less refined than the snappyHexMesh, could this be causing a problem as I've heard that meshes can cause problems? I'm pretty sure the centre of the ami is correctly centred in the dynamicDict as for the small simulation time it can run it appears to rotate properly. The simulation will end very early (in the order of milli-seconds) and unexpectedly because it doesn't even say it's ended when its stop running. The foamLog script is therefore provided to extract data of residuals, iterations, Courant number etc. This is far smaller than specified but it always does it no matter what's specified. When turned on, delta T increases with order of around 10^(-4 to -6). This is with the adjustTimeStep function turned off. paraview to see the flow streamlines in the channel. ![]() The courant number is limited at 1 in the control dict but increases with each iteration, getting in the order of 10^(36) quickly. Implicitness removed the Courant number limitation: we can take larger time. Once the calculations have been completed, users can launch the post-processing. ![]() When checkMesh is ran it has one faliure but I don't know why. convergence of PDEs used by OpenFOAM, the Courant number,, should always be. I'm trying to run a simulation of a wind turbine in pimpeFOAM with the following commands in this order surfaceFeatureExtract, blockMesh, snappyHexMesh -overwrite, renumberMesh -overwrite, createPatch -overwrite, checkMesh, pimpleFOAM. The calculated results of flow fields can be displayed by ParaView (OpenFOAMs postprocessor) or converted to other post.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |