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port flow analysis in internal combustion engine , rhosimpleFoam NOT converging |
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November 3, 2017, 09:15 |
port flow analysis in internal combustion engine , rhosimpleFoam NOT converging
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Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 8 |
Hi guys.
I'm a student and i' m new in open foam simulation.. I' m trying to evaluate the flow coefficient through a poppet valve of an internal comb. engine . I have modeled my geometry by solidworks providing a semi sphere as a rest chamber before the main inlet duct and then a another "plenum" behind the cylinder and then a another "plenum" behind the cylinder displacement (having cylindrical shape too). the solver that i must use is rhosimpleFoam since my case is stationary , compressible. I' ve made two type of simulation. 1) First of all i' ve tried to impose a pressure drop between inlet (semi sphere) and outlet 2) then i change the bc by imposing a mass flow rate instead of a pressure drop . In both case i cannot reach convergence . it seems that some heavy unsteady phenomena arouse (especially around the poppet valve) that prevent the case to reach a convergent solution. CheckMesh seems ok and not give me any warning... I' ve try a lot of configuration : only laminar flow (instead of k-omega turbulence model) , larger cell of blockMesh ecc, larger plenum chamber at outlet .. but nothing seems work. i' ve stayed on ths project for weeks and weeks but i didn't managed to reach any type of solution. Could anyone help me by take a look on the case? i' ve uploaded the case via google drive at this link. https://drive.google.com/file/d/0B_R...ew?usp=sharing here instead i give checkMesh log: Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 4272659 faces: 12025709 internal faces: 11751182 cells: 3903207 faces per cell: 6.09163 boundary patches: 10 point zones: 1 face zones: 3 cell zones: 0 Overall number of cells of each type: hexahedra: 3512127 prisms: 47047 wedges: 0 pyramids: 0 tet wedges: 752 tetrahedra: 3 polyhedra: 343278 Breakdown of polyhedra by number of faces: faces number of cells 4 51944 5 28009 6 29925 7 113169 8 53725 9 38062 10 970 11 298 12 15864 13 53 14 61 15 10827 16 6 17 1 18 363 21 1 Checking topology... Boundary definition OK. Cell to face addressing OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. Number of regions: 1 (OK). Checking patch topology for multiply connected surfaces... Patch Faces Points Surface topology inlet 56952 71836 ok (non-closed singly connected) piatto 9949 11307 ok (non-closed singly connected) condotto 79887 104802 ok (non-closed singly connected) guida 4326 5685 ok (non-closed singly connected) valvole 57033 64591 ok (non-closed singly connected) sedi 11158 15191 ok (non-closed singly connected) testa 26416 29430 ok (non-closed singly connected) outlet 1581 1613 ok (non-closed singly connected) cilindro 17224 18461 ok (non-closed singly connected) plenum 10001 10123 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (0.0367242 -0.18 0.346475) (0.236754 0.323378 0.628011) Mesh has 3 geometric (non-empty/wedge) directions (1 1 1) Mesh has 3 solution (non-empty) directions (1 1 1) Boundary openness (-3.22993e-16 -1.18435e-16 4.97165e-16) OK. Max cell openness = 4.30493e-16 OK. Max aspect ratio = 13.9639 OK. Minimum face area = 2.01645e-09. Maximum face area = 6.50251e-06. Face area magnitudes OK. Min volume = 4.14004e-13. Max volume = 1.05867e-08. Total volume = 0.00404849. Cell volumes OK. Mesh non-orthogonality Max: 64.9158 average: 6.94015 Non-orthogonality check OK. Face pyramids OK. Max skewness = 3.80401 OK. Coupled point location match (average 0) OK. Mesh OK. End |
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