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December 7, 2009, 14:25 |
two-stroke engine
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#1 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
Hello everybody,
I am a Ph.D. student and I need to simulate a two-stroke engine with Fluent. Does anybody have information or tutorials about that? My mail is lamasgaldo@yahoo.es |
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December 7, 2009, 20:52 |
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#2 |
Senior Member
YH Tan
Join Date: Mar 2009
Location: Malaysia
Posts: 119
Rep Power: 17 |
Isabel,
I currently also working on 2 stroke engine for my master thesis. I already able to create the engine with port and functioning. Just have no idea on how to use UDF to calculate the traped volume and other 2 stroke engine parameter. Post ur question here see if able to help out.
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Herntan, Add Reputation if I am right |
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December 9, 2009, 03:51 |
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#3 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
Thank you very much, herntan.
My problem is that I am begining with my thesis and I don't have any information of how to simulate a two-stroke engine in Fluent. Do you mind sending your master thesis to my mail? It would be very helpful for me. |
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December 10, 2009, 02:20 |
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#4 |
Senior Member
YH Tan
Join Date: Mar 2009
Location: Malaysia
Posts: 119
Rep Power: 17 |
Model up ur engine using CAD software / gambit first.
Send me the CAD data and i will show u what u need to do.
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Herntan, Add Reputation if I am right |
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July 6, 2010, 03:24 |
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#5 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
Hello herntan,
I have successfully modelled my mesh in SolidWorks and Gambit. I implemented it in Fluent, defined the movement of the piston and it works Ok. Now I need to define how I am going to treat the two components. I have read the Fluent manual and I saw that I can implement the "VOF" or the "species transport" models. Which do you recommend? |
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July 6, 2010, 07:27 |
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#6 |
Senior Member
YH Tan
Join Date: Mar 2009
Location: Malaysia
Posts: 119
Rep Power: 17 |
What kind of fuel you are using?
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Herntan, Add Reputation if I am right |
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July 7, 2010, 02:19 |
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#7 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
I want to simulate the scavenging process, and not the combustion. So the kind of fuel is not important.
For the scavenging process, I do not know if is better the "VOF" model or the "species transport, no-premixed combustion" model |
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July 7, 2010, 10:47 |
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#8 |
Senior Member
YH Tan
Join Date: Mar 2009
Location: Malaysia
Posts: 119
Rep Power: 17 |
you don't need all those for air to air scavenging process.
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Herntan, Add Reputation if I am right |
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July 8, 2010, 02:48 |
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#9 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
Then, which is more appropiate, the "VOF" of the "species transport" model?
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July 8, 2010, 07:35 |
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#10 |
Senior Member
YH Tan
Join Date: Mar 2009
Location: Malaysia
Posts: 119
Rep Power: 17 |
species transport is only for the simulation that have mixing of 2 different kind of fluid.
Since all of ur fluid is air, species transport is no needed at all. VOF is for simulation when there is 2 type of fluid involve and the surface of contacting is very important. Some ppl use VOF to do bubble in water. But again, since ur only have 1 kind of fluid, VOF is totally irrelavent. Hope this help u out.
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Herntan, Add Reputation if I am right |
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August 6, 2010, 05:57 |
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#11 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
Hello Herntan,
I have succesfully modeled my engine and compared to experimental results. Now I want to calculate the scavenging efficiency, trapping efficiency and charging efficiency. Did you do that? I read that there is an UDF written by Dr Xiao Hu which calculates the scavenging efficiency, but I do not know where I can find it. |
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August 6, 2010, 09:29 |
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#12 |
New Member
Mas
Join Date: Jan 2010
Location: Japan
Posts: 24
Rep Power: 16 |
Hi isabel and herntan,
I have a read a conference paper regarding the two-stroke scavenging calculation. He used VOF with 2 fluid. First he initiallized 100% fluid1 in the cylinder, next he intake fluid2. He then evaluate the ratio of those 2 fluids and relates them with scavenging efficiency. Unfortunately, I have forgotten the reference paper information, but the year is either 2004 or 2005. This maybe rather crude, but I hope this will spark you some idea.
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<Mas> |
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August 6, 2010, 16:54 |
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#13 |
New Member
Hans-Petter
Join Date: Apr 2010
Posts: 6
Rep Power: 16 |
I have the UDF in question, if you give me an e-mail adress I can send it to you. I am also doing a 2-stroke engine in Fluent for my MSc thesis. I am struggeling as well.
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August 7, 2010, 02:54 |
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#14 |
New Member
jamie hong
Join Date: Jul 2010
Location: brunei
Posts: 19
Rep Power: 16 |
Dear Sir,
My model is square shape, 2D , simple model .The pink colour represent the reaction between reactant(e.g.glycerol with steam) , with the product (e.g. as hydrogen , carbon monoxide & carbon dioxide). I had key in the reactants & the products already by selecting: ->define ->materials :name the each reactants & products -Selecting material type : mixture -Fluent mixture material : mixture-template -key in all the reactants & products in properties (mixture species : name) -key in number of mole for each reactant & product in properties(reaction:finite rate) All the reactants & products can be obtain from the fluent database. The red one represent the catalyst. I need to create the catalysts (e.g platinum-titanium oxide , platinum-silicon oxide and platinum-aluminium oxide ) . How should I do it? CAn I directly change the mesh size in the gambit file ,than convert to mesh file ,to be open in fluent software?? |
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August 10, 2010, 01:54 |
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#15 |
Senior Member
isabel
Join Date: Apr 2009
Location: Spain
Posts: 171
Rep Power: 17 |
Hello robot,
Effectively, you can change the mesh size in gambit. You can also change the mesh size in fluent. |
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August 10, 2010, 07:18 |
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#16 |
New Member
jamie hong
Join Date: Jul 2010
Location: brunei
Posts: 19
Rep Power: 16 |
Dear Isabel,
My problem here is, I had already draw the 2D model. The catalysts that I'm going to use are platinum-titanium oxide, platinum-aluminium oxide and platinum carbon. If the average size for platinum-carbon is 5nano meter ,how am I going to change the mesh size in gambit & fluent ? hope you can help me . Thanks you |
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October 14, 2015, 00:48 |
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#17 |
New Member
Manahara Manatunga
Join Date: Mar 2014
Posts: 15
Rep Power: 12 |
Hi Isabel,
How did you set about achieving this? I have seen a UDF written by Ansys that works with the InCylinder model to calculate TE, SE and CE but my issue is that I am modelling an engine that works with a Scotch-Yoke. The piston motion is a perfect sinusoid. Therefore I had to define the zone motion using a UDF rather than using the InCylinder model. The Scavenging efficiency calculator UDF provided by Ansys works with the InCylinder model but I don't really know how to customise it to work without InCyl. If you have already figured this one out it would be massively beneficial to me!! Thank you, Mana |
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September 10, 2018, 11:23 |
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#18 | |
New Member
zena suner zang
Join Date: Jul 2018
Posts: 2
Rep Power: 0 |
Quote:
zen2018cfd@gmail.com thank you very much |
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