# round tube - checkMesh error

 Register Blogs Members List Search Today's Posts Mark Forums Read

 November 5, 2013, 12:02 round tube - checkMesh error #1 New Member   klemen Join Date: Aug 2012 Location: Slovenia Posts: 21 Rep Power: 6 When i made a straight tube and "checkMesh" i receive no errors. But when i add a 90° round tube on top, "checkMesh" returns 4 errors (please see below). I made a round tube using this instructions: defining and connecting two circular pipes using blockMesh When i run paraFoam, everything looks nice. I tried to change the tube grading but this didn't solve the "High aspect ratio" problem. I have no idea how could i solved the non-orthogonality error - isn't this obveous that the faces will be non orthogonal if the tube is not straight? Any idea how can i solve this problem? Regards Klemen -------------------------- Checking geometry... Overall domain bounding box (-0.008 -0.00654102 0.002) (0.00654102 0.00654102 0.0339986) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (-1.31732e-17 1.60882e-17 2.02306e-16) OK. ***High aspect ratio cells found, Max aspect ratio: 7.93329e+192, number of cells 330 <

November 13, 2013, 03:46
#2
Member

B T KANNAN
Join Date: Jul 2011
Posts: 54
Rep Power: 7
Quote:
 Originally Posted by fogl When i made a straight tube and "checkMesh" i receive no errors. But when i add a 90° round tube on top, "checkMesh" returns 4 errors (please see below). I made a round tube using this instructions: defining and connecting two circular pipes using blockMesh When i run paraFoam, everything looks nice. I tried to change the tube grading but this didn't solve the "High aspect ratio" problem. I have no idea how could i solved the non-orthogonality error - isn't this obveous that the faces will be non orthogonal if the tube is not straight? Any idea how can i solve this problem? Regards Klemen -------------------------- Checking geometry... Overall domain bounding box (-0.008 -0.00654102 0.002) (0.00654102 0.00654102 0.0339986) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (-1.31732e-17 1.60882e-17 2.02306e-16) OK. ***High aspect ratio cells found, Max aspect ratio: 7.93329e+192, number of cells 330 <
Reduce non-orthogonality, skewness etc.,
Try increasing the number of cells in the round tube.
--
KANNAN

 July 9, 2014, 06:54 #3 New Member   Ali Heidari Join Date: May 2013 Location: Tehran,Iran Posts: 6 Rep Power: 5 hello klemen. i have the same problem. can you solve this problem?? Thanks. Regards

 July 9, 2014, 15:17 #4 New Member   klemen Join Date: Aug 2012 Location: Slovenia Posts: 21 Rep Power: 6 Hello Ali, I think i solved the problem by defining the circle (tube cross section) from five patches - a square in the middle and four curved trapezoids around the square. I don't have the access to my computer at the moment, but i can check it next week - let me know if you don't succeed. Regards Klemen

 July 10, 2014, 06:27 #5 New Member   Ali Heidari Join Date: May 2013 Location: Tehran,Iran Posts: 6 Rep Power: 5 Thank you very much Klemen. My blockMesh file is: code: Code: ```/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 0.01; vertices ( (0 8 2) (10 0 1.5) (10 3 2) (1 8 2) (0 8 0) (10 0 0.5) (10 3 1) (1 8 0) ); blocks ( hex (0 1 2 3 4 5 6 7) (40 15 10) simpleGrading (1 1 1) ); edges ( ); boundary ( inlet { type patch; faces ( (0 4 7 3) ); } outlet { type patch; faces ( (1 2 6 5) ); } Wall { type wall; faces ( (0 1 2 3) (4 5 6 7) (3 2 6 7) (0 1 5 4) ); } ); mergePatchPairs ( ); // ************************************************************************* //``` When i run blockMesh with this vertices, i get the error massage: Code: ```Checking geometry... Overall domain bounding box (0 0 0) (0.1 0.08 0.02) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (5.08774e-17 -1.73343e-16 -2.05592e-16) OK. ***High aspect ratio cells found, Max aspect ratio: 2.76503e+194, number of cells 6000 <

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post shashank312 Fluent UDF and Scheme Programming 6 May 30, 2013 20:30 Yogini Fluent UDF and Scheme Programming 7 October 3, 2012 07:24 vaina74 OpenFOAM Installation 13 February 3, 2012 18:43 piotka STAR-CD 4 June 12, 2009 08:43 ivanyao OpenFOAM Running, Solving & CFD 6 September 5, 2008 20:50

All times are GMT -4. The time now is 23:42.