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Showing results 1 to 24 of 24 Search took 0.00 seconds. Search: Posts Made By: RiKR0K

Forum: FLUENT June 19, 2010, 18:37

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K hello I have another question, If you see the... hello I have another question, If you see the image I posted, it is a normal football where I did the analysis, I wanted to see more the edges and pattern, like this second image I found on the net...

Forum: FLUENT June 15, 2010, 06:51

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I have a question regarding the Magnus (or lift... I have a question regarding the Magnus (or lift force) it's about the expression that is used to calculate the Magnus force, I've found 2 of them and don't know which is the right one is it: ...

Forum: FLUENT May 4, 2010, 11:07

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I put an image of the orientation of the mesh... I put an image of the orientation of the mesh attached In the boundary condition for the ball: I have motion rotational and then a rotation-axis origin which I defined 0 for x,y,z and I have...

Forum: FLUENT May 4, 2010, 09:22

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K By that you mean drag and lift? I only have that... By that you mean drag and lift? I only have that in the monitors option, I don't have spin vector, drag is in x=1 and lift is y=1

Forum: FLUENT May 4, 2010, 08:54

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I obtained an angular velocity of 17,4 rad/s,... I obtained an angular velocity of 17,4 rad/s, considering sp=0,2 and v=30m/s, if I input these velocities on fluent I won't obtain lift, when I input a velocity higher than the angular velocity I...

Forum: FLUENT May 4, 2010, 08:30

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K Right now my main difficulties are in the fluent... Right now my main difficulties are in the fluent part, where I now see that according to the spin parameter where the range is 0-0,20: Sp=r*ang_vel/flow_vel If I input a velocity flow of 30...

Forum: FLUENT May 3, 2010, 16:44

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K So the spin parameter was calculated, right? it... So the spin parameter was calculated, right? it wasn't input in fluent?tnhx for the help, I'll be awaiting the plot tomorow

Forum: FLUENT May 3, 2010, 16:08

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K Ok I'd really appreciate if you could send me... Ok I'd really appreciate if you could send me those results, by the way what were the values you used to obtain the spin parameter and magnus coefficient?

Forum: FLUENT May 3, 2010, 11:48

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I tried contacting the both of them, only Matt... I tried contacting the both of them, only Matt Carre responded, he told me it's very difficult to simulate the airflow around a sphere in CFD and that he wasn't an expert on CFD, I think Sarah Barber...

Forum: FLUENT May 3, 2010, 11:37

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K In this case, when I input rotation to the ball,... In this case, when I input rotation to the ball, it's the cl coefficient that's equal to the cs coefficient that's equal to the cm magnus coefficient, right?

Forum: FLUENT May 1, 2010, 07:36

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I'm just having problems with defining the... I'm just having problems with defining the velocity, in a real situation do you have any ideia about the velocity and angular velocity I should define on the ball? I've tried searching for real...

Forum: FLUENT April 30, 2010, 13:22

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I've checked the axes as shown in the picture and... I've checked the axes as shown in the picture and changed it to Y, the force was already 1 in Y, as for the rotation I changed it to 137 rad/s and left the inlet as 1 m/s, cl=-5,75e-3 and cd=2,96e-2,...

Forum: FLUENT April 30, 2010, 09:56

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K This is the velocity (vector, pathline and... This is the velocity (vector, pathline and contour) and the pressure contour with the inlet velocity=1 and the moving wall=5 rad/s

Forum: FLUENT April 30, 2010, 08:41

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K this is what I did, I'll give you some more... this is what I did, I'll give you some more images on the results

Forum: FLUENT April 30, 2010, 08:34

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K This how my mesh looks like: This how my mesh looks like:

Forum: FLUENT April 30, 2010, 08:00

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K My radius was 34,5 cm, I have a question where do... My radius was 34,5 cm, I have a question where do you apply this: for 1st upwind: wall y+ = 50 +/- 10 cd = 3.9 cl = -7 for 2nd upwind: wall y+ = 49 +/- 9 cd = 1.9

Forum: FLUENT April 30, 2010, 05:51

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K In 2D, I defined the k-e standard model and... In 2D, I defined the k-e standard model and defined a inlet velocity of 10 m/s, what was yours? after the iteration my values were: 0 rad/s -> cl = 2.41e-2, cd = 8.9e-1 5 rad/s -> cl = 2.17e-2,...

Forum: FLUENT April 29, 2010, 13:59

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K Hello I've done the analysis on the sphere... Hello I've done the analysis on the sphere with one option on stationary wall and another with rotation and the results of cl and cd are really close to one each other, I think it's not working...

Forum: FLUENT April 28, 2010, 12:12

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K It's the effect of the spin you shoot a ball... It's the effect of the spin you shoot a ball elsewhere the center, it's also called the sideways coefficient

Forum: FLUENT April 28, 2010, 11:46

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I left the cell zone conditions of the fluid as... I left the cell zone conditions of the fluid as stationary and at the boundary conditions I changed the hollow sphere to moving wall and added rotation, I just have another question, in the monitors...

Forum: FLUENT April 28, 2010, 06:37

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K Tnhx for the help, the Ansys I'm working is 12.1... Tnhx for the help, the Ansys I'm working is 12.1 and I just have one more question, it's regarding the geometry, I have done 2 diferent types: First solution: I've done a cylinder defined as...

Forum: FLUENT April 27, 2010, 11:38

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I would really appreciate if someone could supply... I would really appreciate if someone could supply me with a udf model of a rotating sphere

Forum: FLUENT April 16, 2010, 14:29

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K I've done the geometry and mesh in Ansys... I've done the geometry and mesh in Ansys Workbench, do you apply that MRF model in Fluent? I'm trying to find that option in fluent but I can't find it, in the cell zone conditions there is a option...

Forum: FLUENT April 16, 2010, 06:12

Replies: 46 Rotating a sphere Views: 10,925 Posted By RiKR0K Rotating a sphere Hello I'm trying to apply spinning on a sphere in the air, but I don't know how to do it, I've done two models one in 2D and another in 3D, someone told me it is with the dynamic mesh, but I really...

Showing results 1 to 24 of 24

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