Heat exchanger issue.

MantiumFlow CFD Software SupportHeat exchanger issue.
From MVRC Staff asked 1 week ago

Hello again. I’m having an issue on my heat exchanger. solver.log have this: Pstream initialized with: floatTransfer : 0 nProcsSimpleSum : 0 commsType : nonBlocking polling iterations : 0 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 SIMPLE: convergence criteria field p tolerance 5e-005 field “(U|k|epsilon|omega)” tolerance 1e-006 Reading field p Reading field U Reading/calculating face flux field phi Selecting incompressible transport model Newtonian Selecting turbulence model type RAS Selecting RAS turbulence model realizableKE RAS { RASModel realizableKE; turbulence on; printCoeffs on; A0 4; C2 1.9; sigmak 1; sigmaEps 1.2; } Creating MRF zone list from MRFProperties Creating finite volume options from “system/fvOptions” Selecting finite volume options model type explicitPorositySource Source: porosity_hx_sx – selecting cells using cellZone hx_sx [0] [0] [0] [1] [2] –> FOAM FATAL ERROR: [4] [3] [1] [2] [5] [0] [6] [4] Cannot find cellZone hx_sx Valid cellZones are 0() [7] [3] [1] [2] [5] –> FOAM FATAL ERROR: [6] [4] –> FOAM FATAL ERROR: [0] [7] [3] –> FOAM FATAL ERROR: [5] –> FOAM FATAL ERROR: [1] [6] [2] –> FOAM FATAL ERROR: [0] [7] Cannot find cellZone hx_sx Valid cellZones are 0() –> FOAM FATAL ERROR: [4] Cannot find cellZone hx_sx Valid cellZones are 0() From function –> FOAM FATAL ERROR: [3] Cannot find cellZone hx_sx Valid cellZones are 0() [5] void Foam::fv::cellSetOption::setCellSet() Cannot find cellZone hx_sx Valid cellZones are 0() [1] [6] [2] Cannot find cellZone hx_sx Valid cellZones are 0() [7] Cannot find cellZone hx_sx Valid cellZones are 0() [4] [0] Cannot find cellZone hx_sx Valid cellZones are 0() [3] [1] [2] [5] in file From function [6] [4] From function cellSetOption/cellSetOption.C [7] [3] void Foam::fv::cellSetOption::setCellSet() From function void Foam::fv::cellSetOption::setCellSet() [5] at line From function [6] void Foam::fv::cellSetOption::setCellSet() From function 142 [7] void Foam::fv::cellSetOption::setCellSet() [1] From function [2] void Foam::fv::cellSetOption::setCellSet() . From function in file void Foam::fv::cellSetOption::setCellSet() [4] in file void Foam::fv::cellSetOption::setCellSet() [3] cellSetOption/cellSetOption.C in file cellSetOption/cellSetOption.C [5] [0] in file at line [6] cellSetOption/cellSetOption.C at line in file FOAM parallel run exiting [7] cellSetOption/cellSetOption.C 142 in file at line 142 cellSetOption/cellSetOption.C [0] in file at line . cellSetOption/cellSetOption.C 142 . at line cellSetOption/cellSetOption.C 142 at line . 142 at line . [1] 142 [2] . 142 FOAM parallel run exiting . [4] FOAM parallel run exiting . [3] [1] FOAM parallel run exiting [2] [5] FOAM parallel run exiting [6] [4] FOAM parallel run exiting [7] [3] FOAM parallel run exiting [5] FOAM parallel run exiting [6] [7] job aborted: [ranks] message [0] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 0 [1] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 1 [2] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 2 [3] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 3 [4] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 4 [5] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 5 [6] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 6 [7] application aborted aborting MPI_COMM_WORLD (comm=0x44000000), error 1, comm rank 7 —- error analysis —– [0-7] on DESKTOP-P3UPDBJ simpleFoam aborted the job. abort code 1 —- error analysis —–

6 Answers
From MVRC Staff answered 1 week ago

Ah posting it like that was clearly a mistake. Lemme give you the complete log on gdrive: https://drive.google.com/open?id=1bpt-v80hvuB_-nMiTKRGOPzcg8r3CDs_

MCAE Support Staff answered 1 week ago

Hi,
the message tells you that there is no cell zone for the heat exchanger. This could have a few different reasons.
I suspect that the meshing step somehow failed. A prime candidate cause that is open geometry causing a mesh getting so huge, your computer runs out of memory and crashes that step. You should check the chekmesh.log and make sure you have a mesh with roughly 6e6 cells.

From MVRC Staff answered 1 week ago

I suspect my geometry is far too complex and eats up all my ram. I’ll try a simpler mesh.

MCAE Support Staff answered 1 week ago

Send the mesh.log in a reasonable format, so I can hopefully check.

From MVRC Staff answered 1 week ago

I’m sending the logs and the mesh. I’m aware that my mesh is not completely legal at the moment. I was just trying to get an idea about the design. https://drive.google.com/open?id=1vHlc1f0wtGvnhb7M3lz2F4ELidy-9kqK

From MVRC Staff answered 1 week ago

Turns out it was a ram issue. 16 gigs of ram wasnt cut out for a complex hx model i guess.