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October 13, 2014, 01:17 |
curve in airfoil
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#1 |
Senior Member
Aja
Join Date: Nov 2013
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Hi Friends
I have a two-dimensional airfoil got into Gambit. I wanted to know how to give it a curve? Wells turbine is the subject of the my Thesis. Note the curvature of the tip in the image below: Thanks for your help |
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October 13, 2014, 01:36 |
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#2 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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display what you already have in Gambit
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In memory of my friend Hervé: CFD engineer & freerider |
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October 13, 2014, 12:08 |
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#3 |
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Aja
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October 13, 2014, 12:15 |
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#4 |
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Rick
Join Date: Oct 2010
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I would:
- merge edges; - create the face from merged edges; - create a volume from sweeping the created face (+z direction); - copy/rotate the volume aroung the central axis; - create the central cilinder volume; - merge all the volumes; - if you need to "curve" external surfaces, create a cilinder volume and cut the blades; - create external volume (air volume); - subtract internal (solid) volume from external (air) volume. |
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October 13, 2014, 14:07 |
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#5 | |
Senior Member
Aja
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Quote:
Thank you. But as the following: modelling: We use the periodic boundary condition now,What should I do? Thanks for your help |
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October 13, 2014, 14:21 |
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#6 |
Senior Member
Aja
Join Date: Nov 2013
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Sorry,I have an other question:
Assuming that it is available vertexes of airfoil. How to put vertexes of airfoil on the Cylinder(Cylinder that must be cut)? Because the beginning, the points of airfoils are no curvature. I'm confused!!!!! |
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October 14, 2014, 00:51 |
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#7 | ||
Super Moderator
Maxime Perelli
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Quote:
Quote:
From here you have a full modell. If you want to work with periodicity, you can split the model I didn't get your point
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In memory of my friend Hervé: CFD engineer & freerider |
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October 14, 2014, 02:05 |
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#8 | |
Senior Member
Aja
Join Date: Nov 2013
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Quote:
I don't have any idea about it the software I used is Gambit ver.2.4 Thank you for Your help |
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October 14, 2014, 02:50 |
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#9 |
Super Moderator
Maxime Perelli
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As ghost82 mentionned, you can merge all your tiny edges from airfoil, except both designing trailing edge.
Doing that you will still have one vertex (sharp angle from trailing edge) You are also free to choose another one vertice: you can for example use the split edge tool: https://www.sharcnet.ca/Software/Gam...eom_edge_split
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In memory of my friend Hervé: CFD engineer & freerider |
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October 14, 2014, 04:43 |
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#10 | |
Senior Member
Rick
Join Date: Oct 2010
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Quote:
here is what I mean: When you merge the 2 volumes, after sweeping the airfoil, you will have the airfoil edge automatically projected to the cylinder (bottom-left image). If you need to curve the airfoil create a new cilinder (red dotted) and cut the 3d blade, then delete the more external volume (black dotted). |
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October 15, 2014, 03:01 |
thank
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#11 |
Senior Member
Aja
Join Date: Nov 2013
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Rep Power: 14 |
hi my dear friends.
I can almost design Primary model with your guidance s but for merge edge I face a problem. Edge merge method don't understand.how merge edge? for this reason,i am doing edge and faces without merge but for Construct blade volume i face a problem and blade volume don't Construct correctly,attention to bellow image: According to the following image, For merge,two Later edge don't consider but get following error: too,total edges consider but again get following error: vertexes of airfoil figure Before construct volume: vertexes of symmetrical airfoil: edge and faces of symmetrical airfoil: Blade figure Before construct volume: figure of modeling: Thank you for allocating your time. |
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October 15, 2014, 04:02 |
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#12 |
Super Moderator
Maxime Perelli
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follow instructions from ghost82: work only with volumes (not surfaces)
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In memory of my friend Hervé: CFD engineer & freerider |
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October 15, 2014, 06:00 |
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#13 |
Senior Member
Rick
Join Date: Oct 2010
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Merge edges!
see here: https://www.sharcnet.ca/Software/Gam...ide/mg0203.htm Default is split edge, so right click on the split edge button to select merge edges, select 2 edges at a time and merge them. I suggest to leave 2 vertices to easily mesh geometry (see picture). PS: I'm automatically updated when somebody reply to this thread so no need to send private messages :P |
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October 15, 2014, 08:37 |
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#14 |
Senior Member
Aja
Join Date: Nov 2013
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hi,thanks
In some cases when I do merge some edges by the chance it merges and virtual edge is created instead of the real edge. is there any rule for merging that i don't follow it or these kind of virtual edges don't create any problem in further processing steps? virtual edges: thank for your helps. |
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October 20, 2014, 15:00 |
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#15 |
Senior Member
Aja
Join Date: Nov 2013
Posts: 496
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Dear Friends,
First, I would like to thank you for all your help and inform you that I have finally made my intended model. In my model, I want to make the upper airfoil cord bigger than the buttom one. I would appreciate it if you could kindly give me your advice. if you could send me a visual, H would be thankful. Best, Amir |
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October 21, 2014, 01:20 |
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#16 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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if you modify the design of your airfoil, you will have to redo everything.
But you can use your previous journal file to "automatically" rebuild your geometry. https://www.sharcnet.ca/Software/Gam...#menu_file_run if you only want to extend your domain, the sweep tool should be suitable
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In memory of my friend Hervé: CFD engineer & freerider |
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October 21, 2014, 16:25 |
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#17 | |
Senior Member
Aja
Join Date: Nov 2013
Posts: 496
Rep Power: 14 |
Quote:
thanks Yes, but I my problem is making the blade. Dash line is for previous model. New model is red lines that I do not know that model. In the meantime I've deleted the journal file and have the file (dbs). Until now I did not work with journal file. From First modeling, but how do I create blade? Such post #10 with pictures to explain me,I would be thankful. Thank you for allocating your time. |
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October 22, 2014, 00:52 |
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#18 |
Super Moderator
Maxime Perelli
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How did you create the blade from your previous model?
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In memory of my friend Hervé: CFD engineer & freerider |
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October 22, 2014, 03:07 |
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#19 |
Senior Member
Aja
Join Date: Nov 2013
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hi my dear friend
i have created the blade with sweep tool, and so with volume split tool by face. Procedure is as follows: sweep airfoil(face): create new cylinder: blade volume subtract volume 6: create edges for Faces: created faces: volume split tool by created faces: continue..... |
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October 22, 2014, 03:08 |
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#20 |
Senior Member
Aja
Join Date: Nov 2013
Posts: 496
Rep Power: 14 |
deleted volumes:
Thank you for allocating your time. I really do not know what to do for the new model.Now Here, I do not think the sweep tool is efficient( in Third picture Previous post). best, Amir |
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