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[snappyHexMesh] Invalid Normals for source face to target face while making AMI?

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Old   November 21, 2019, 23:58
Default Invalid Normals for source face to target face while making AMI?
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Saurabh Das
Join Date: Jul 2018
Posts: 43
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I was making a stirrer simulation with pimpleDyMFoam. I made AMIs for simulating the moving mesh. While executing the paraFoam command after making the mesh and patching it, I found the following error message on my console.

Code:
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 177 points 4((-0.0796114 0.155 4.82332e-10) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 0.00243401) (-0.0796045 0.155 0.00231293)) target face 6171 points 4((-0.0769933 0.155 8.00093e-11) (-0.0748773 0.155 2.39736e-11) (-0.0748734 0.155 0.00250567) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 177 points 4((-0.0796114 0.155 4.82332e-10) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 0.00243401) (-0.0796045 0.155 0.00231293)) target face 3083 points 4((-0.0769933 0.155 8.00093e-11) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 -0.00243401) (-0.0770568 0.155 -0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 177 points 4((-0.0796114 0.155 4.82332e-10) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 0.00243401) (-0.0796045 0.155 0.00231293)) target face 1623 points 4((-0.0786529 0.155 0.00243401) (-0.0785225 0.155 2.15921e-10) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 6171 points 4((-0.0769933 0.155 8.00093e-11) (-0.0748773 0.155 2.39736e-11) (-0.0748734 0.155 0.00250567) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 3083 points 4((-0.0769933 0.155 8.00093e-11) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 -0.00243401) (-0.0770568 0.155 -0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 1623 points 4((-0.0786529 0.155 0.00243401) (-0.0785225 0.155 2.15921e-10) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 6731 points 4((4.82333e-10 0.155 0.0796114) (2.15926e-10 0.155 0.0785225) (0.00243401 0.155 0.0786529) (0.00231293 0.155 0.0796045)) target face 7917 points 4((0.00250567 0.155 0.0748734) (0.00252271 0.155 0.0770568) (8.00166e-11 0.155 0.0769933) (2.39806e-11 0.155 0.0748773))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 6731 points 4((4.82333e-10 0.155 0.0796114) (2.15926e-10 0.155 0.0785225) (0.00243401 0.155 0.0786529) (0.00231293 0.155 0.0796045)) target face 3581 points 4((8.00166e-11 0.155 0.0769933) (2.15926e-10 0.155 0.0785225) (-0.00243401 0.155 0.0786529) (-0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 6731 points 4((4.82333e-10 0.155 0.0796114) (2.15926e-10 0.155 0.0785225) (0.00243401 0.155 0.0786529) (0.00231293 0.155 0.0796045)) target face 3589 points 4((0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225) (8.00166e-11 0.155 0.0769933) (0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 7917 points 4((0.00250567 0.155 0.0748734) (0.00252271 0.155 0.0770568) (8.00166e-11 0.155 0.0769933) (2.39806e-11 0.155 0.0748773))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 3581 points 4((8.00166e-11 0.155 0.0769933) (2.15926e-10 0.155 0.0785225) (-0.00243401 0.155 0.0786529) (-0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 3589 points 4((0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225) (8.00166e-11 0.155 0.0769933) (0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 7284 points 4((-0.0748734 0.155 -0.00250567) (-0.0748773 0.155 2.39736e-11) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 -0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 1623 points 4((-0.0786529 0.155 0.00243401) (-0.0785225 0.155 2.15921e-10) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 3083 points 4((-0.0769933 0.155 8.00093e-11) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 -0.00243401) (-0.0770568 0.155 -0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 7901 points 4((8.00166e-11 0.155 0.0769933) (-0.00252271 0.155 0.0770568) (-0.00250567 0.155 0.0748734) (2.39806e-11 0.155 0.0748773))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 3589 points 4((0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225) (8.00166e-11 0.155 0.0769933) (0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 3581 points 4((8.00166e-11 0.155 0.0769933) (2.15926e-10 0.155 0.0785225) (-0.00243401 0.155 0.0786529) (-0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 177 points 4((-0.0796114 0.155 4.82332e-10) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 0.00243401) (-0.0796045 0.155 0.00231293)) target face 6171 points 4((-0.0769933 0.155 8.00093e-11) (-0.0748773 0.155 2.39736e-11) (-0.0748734 0.155 0.00250567) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 177 points 4((-0.0796114 0.155 4.82332e-10) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 0.00243401) (-0.0796045 0.155 0.00231293)) target face 3083 points 4((-0.0769933 0.155 8.00093e-11) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 -0.00243401) (-0.0770568 0.155 -0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 177 points 4((-0.0796114 0.155 4.82332e-10) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 0.00243401) (-0.0796045 0.155 0.00231293)) target face 1623 points 4((-0.0786529 0.155 0.00243401) (-0.0785225 0.155 2.15921e-10) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 7901 points 4((8.00166e-11 0.155 0.0769933) (-0.00252271 0.155 0.0770568) (-0.00250567 0.155 0.0748734) (2.39806e-11 0.155 0.0748773))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 3589 points 4((0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225) (8.00166e-11 0.155 0.0769933) (0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 9159 points 4((4.82333e-10 0.155 0.0796114) (-0.00231293 0.155 0.0796045) (-0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225)) target face 3581 points 4((8.00166e-11 0.155 0.0769933) (2.15926e-10 0.155 0.0785225) (-0.00243401 0.155 0.0786529) (-0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 6731 points 4((4.82333e-10 0.155 0.0796114) (2.15926e-10 0.155 0.0785225) (0.00243401 0.155 0.0786529) (0.00231293 0.155 0.0796045)) target face 7917 points 4((0.00250567 0.155 0.0748734) (0.00252271 0.155 0.0770568) (8.00166e-11 0.155 0.0769933) (2.39806e-11 0.155 0.0748773))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 6731 points 4((4.82333e-10 0.155 0.0796114) (2.15926e-10 0.155 0.0785225) (0.00243401 0.155 0.0786529) (0.00231293 0.155 0.0796045)) target face 3581 points 4((8.00166e-11 0.155 0.0769933) (2.15926e-10 0.155 0.0785225) (-0.00243401 0.155 0.0786529) (-0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 6731 points 4((4.82333e-10 0.155 0.0796114) (2.15926e-10 0.155 0.0785225) (0.00243401 0.155 0.0786529) (0.00231293 0.155 0.0796045)) target face 3589 points 4((0.00243401 0.155 0.0786529) (2.15926e-10 0.155 0.0785225) (8.00166e-11 0.155 0.0769933) (0.00252271 0.155 0.0770568))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 7284 points 4((-0.0748734 0.155 -0.00250567) (-0.0748773 0.155 2.39736e-11) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 -0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 1623 points 4((-0.0786529 0.155 0.00243401) (-0.0785225 0.155 2.15921e-10) (-0.0769933 0.155 8.00093e-11) (-0.0770568 0.155 0.00252271))
--> FOAM Warning : 
    From function void Foam::faceAreaWeightAMI<SourcePatch, TargetPatch>::interArea(const label, const label) const
    in file lnInclude/faceAreaWeightAMI.C at line 359
    Invalid normal for source face 8024 points 4((-0.0796114 0.155 4.82332e-10) (-0.0796045 0.155 -0.00231293) (-0.0786529 0.155 -0.00243401) (-0.0785225 0.155 2.15921e-10)) target face 3083 points 4((-0.0769933 0.155 8.00093e-11) (-0.0785225 0.155 2.15921e-10) (-0.0786529 0.155 -0.00243401) (-0.0770568 0.155 -0.00252271))
On checking the source code faceAreaWeightAMI.c , I found out that this message appears when the magnitude of the vector indicating the normal of a particular face is less than ROOTVMSMALL( A constant with a value 1e-18). But beyond that I dont know much.

Could anyone please help me out with this? If this information is not enough, please notify me.
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