SnappyHexMesh crashed when meshing 9 buildings

[ymg2007]

I am confused about using SnappyHexMesh for meshing 9 buildings.I used the example file called 0.1_0_outdoor_airflow.I just changed the building geometry,other settings is default. I am using Butterfly,with OpenfoamV1612+ in Windows 10 64bit.The blockmesh worked good.And the snappyhexmesh crashed in the process.My computer memory is not enough? Or some settings wrong? Could you help me solve this question? /---------------------------------------------------------------------------
| ========= | | | \ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \ / O peration | Version: v1612+ | | \ / A nd | Web: www.OpenFOAM.com | | \/ M anipulation | | *---------------------------------------------------------------------------*/ Build : v1612+ Exec : snappyHexMesh Date : Aug 27 2017 Time : 09:39:54 Host : "default" PID : 13443 Case : /home/ofuser/workingDir/butterfly/outdoor_airflow nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10) allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time

Create mesh for time = 0

Read mesh in = 2.14 s

Overall mesh bounding box : (-241.5472 -241.4418 0) (496.4376 536.2438 144.8633) Relative tolerance : 1e-06 Absolute matching distance : 0.001081851

Reading refinement surfaces. Read refinement surfaces in = 0.01 s

Reading refinement shells. Refinement level 3 for all cells inside around_buildings_area.stl Read refinement shells in = 0 s

Setting refinement level of surface to be consistent with shells. For geometry outdoor_airflow.stl detected 0 uncached triangles out of 120 Checked shell refinement in = 0 s

Reading features. Read features in = 0 s

Determining initial surface intersections

Edge intersection testing: Number of edges : 1684728 Number of edges to retest : 1684728 Number of intersected edges : 5583 Calculated surface intersections in = 1.68 s

Initial mesh : cells:554112 faces:1684728 points:576779 Cells per refinement level: 0 554112

Adding patches for surface regions

Patch Type Region

---

outdoor_airflow:

6 wall buildings

Added patches in = 0.03 s

Edge intersection testing: Number of edges : 1684728 Number of edges to retest : 0 Number of intersected edges : 5583 Selecting decompositionMethod none

Refinement phase

Found point (127.4452 147.401 72.43167) in cell 402042 on processor 0

Surface refinement iteration 0

Marked for refinement due to surface intersection : 8820 cells. Determined cells to refine in = 3.87 s Selected for refinement : 8820 cells (out of 554112) Edge intersection testing: Number of edges : 1883850 Number of edges to retest : 250376 Number of intersected edges : 21198 Refined mesh in = 1.77 s After refinement surface refinement iteration 0 : cells:615852 faces:1883850 points:652499 Cells per refinement level: 0 545292 1 70560

Surface refinement iteration 1

Marked for refinement due to surface intersection : 38502 cells. Determined cells to refine in = 0.04 s Selected for refinement : 40392 cells (out of 615852) Edge intersection testing: Number of edges : 2787132 Number of edges to retest : 1118049 Number of intersected edges : 85655 Refined mesh in = 3.17 s After refinement surface refinement iteration 1 : cells:898596 faces:2787132 points:990317 Cells per refinement level: 0 543235 1 48681 2 306680

Surface refinement iteration 2

Marked for refinement due to surface intersection : 159213 cells. Determined cells to refine in = 0.1 s Selected for refinement : 168471 cells (out of 898596) Edge intersection testing: Number of edges : 6576117 Number of edges to retest : 4737635 Rhino Model and GH files is in t'he zip file.Please help me solve this question!~~

9_buildings CFD simulatiton.zip

[lamlvo]

As my experience, the block mesh that you put is quite dense at the front.

1. Try use another factor in grading just around Object. (x,y direction)
2. Open virtual box and increase the ram memory and processor
3. Try increase the cellsizexyz And rerun again. Because as I see your block mesh doesn't work with 9 buildings. Best,

[ymg2007]

Thanks for your suggestions.I will try it later.