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Showing results 1 to 25 of 30 Search took 0.00 seconds. Search: Posts Made By: darkluix88

Forum: FLUENT December 2, 2014, 06:47

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Okok, in the sense that fluent probably recognize... Okok, in the sense that fluent probably recognize di original units of measure of the mesh when you insert some values in the udf, right? I'll try and see the result :)

Forum: FLUENT December 2, 2014, 05:02

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 ahahah :D are you Italian too? I didn't notice... ahahah :D are you Italian too? I didn't notice it! XD. Actually I've encountered another problem, it's a problem regarding the units of velocity when i plot the velocity magnitude in a determinate...

Forum: FLUENT November 27, 2014, 11:17

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Great, the udf runs and it seems that the... Great, the udf runs and it seems that the simulation goes on correctly! Now I'm working on how improve the calculation...I want to thank you for all the help gave me! ;) If there's another problem...

Forum: FLUENT November 26, 2014, 12:35

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Thanks ghost82, I've tried and to prove the... Thanks ghost82, I've tried and to prove the movement of the fluid I've increase the time step and it moves! :D I've only another question regarding the centre of rotation, around I apply the...

Forum: FLUENT November 26, 2014, 11:59

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 It's possible to apply the Frame Motion for... It's possible to apply the Frame Motion for transient problems using udf, and I've tried for translation-sinusoidal velocity and I ve obtained an optimum result :) But now, I've a problem with the...

Forum: FLUENT November 19, 2014, 05:58

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Hi ghost82, actually I'm seeing the method to... Hi ghost82, actually I'm seeing the method to simulate the sloshing phenomenon with Frame Motion command and loading in "Zone Motion" an udf with sinusoidal velocity to impose, because now the study...

Forum: FLUENT November 13, 2014, 09:20

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Ahhh okok now I've understood, I've confused A as... Ahhh okok now I've understood, I've confused A as the amplitude of theta (angle position)! Perfect, I will try these days and I'll let you know if it works :)

Forum: FLUENT November 13, 2014, 08:34

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Hi ghost82, reading the equations I would ask you... Hi ghost82, reading the equations I would ask you some points: 1) omega=A*sen(2*pigreco*f*t) ------ if omega is angular velocity, with the dimensional analysis I should have [rad/s], but if A is in...

Forum: FLUENT November 11, 2014, 09:52

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Thanks for the help ghost82 :) I've trying to... Thanks for the help ghost82 :) I've trying to make this example: I have the classic rectangular 2d tank on XY plane, I wanna impose a rotational movement (sinusoidal) alternatively 45 degrees to...

Forum: FLUENT November 10, 2014, 16:58

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Hi ghost82, returning to the momentum source... Hi ghost82, returning to the momentum source method to simulate sloshing, how can I write the udf for the rotation source, defining the centre of rotation and the axis? For example, if I want apply...

Forum: FLUENT November 6, 2014, 17:38

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 I obtain the same result....ok thanks, for now I... I obtain the same result....ok thanks, for now I post newly the question because I have to go on with my thesis

Forum: FLUENT November 6, 2014, 17:30

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Hi ghost82, I ve tried these days applying... Hi ghost82, I ve tried these days applying dynamic mesh with walls as rigid body and also the default_interior as rigid body, but it doesn't run. In fact the tank moves but the fluid inside remain...

Forum: FLUENT November 3, 2014, 05:38

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Okok, I will try this approach to various cases... Okok, I will try this approach to various cases and I'll let you know ;) Now I've understood, but I've to set a particular condition to avoid the cell's deformation with this scheme or it's...

Forum: FLUENT November 3, 2014, 05:01

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Exactly, I didn't notice it! :) So are... Exactly, I didn't notice it! :) So are considered all the forces related to the movement imposed? I thought that the effect of coriolis (as centrifugal/centripetal effects) should be an effect...

Forum: FLUENT November 3, 2014, 04:22

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 I've tried this type of udf and it works! Only... I've tried this type of udf and it works! Only I've explouted the cotangent expression because in udf cotangent command isn't detectedby fluent. Thanks for your help :) Now I wanna use for example...

Forum: FLUENT November 2, 2014, 12:50

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Ah okok, I thought that dS[eqn] was different to... Ah okok, I thought that dS[eqn] was different to 0 because, being the source (acceleration)*(density) and acceleration = (velocity/time), it contains the velocity expression inside of...

Forum: FLUENT November 2, 2014, 12:19

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Okok, now I've understood how to approach the... Okok, now I've understood how to approach the problem better! So, at first I've to convert the physical quantity that I want to apply in momentum as N/m3, next I define the variable "source" as the...

Forum: FLUENT November 2, 2014, 09:04

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 How can I convert a sinusoidal velocity to N/m3?... How can I convert a sinusoidal velocity to N/m3? The only parameters known are these ones: amplitude, phase and pulsation (or frequency, is the same). The initial phase is the delay/advance...

Forum: FLUENT November 2, 2014, 05:30

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Thanks for the help and I'm sorry for the too... Thanks for the help and I'm sorry for the too many questions that I ask you :o Ok, I'm reading the manual and approaching to create the source file udf but I'm probably getting wrong...actually my...

Forum: FLUENT November 1, 2014, 11:52

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 This one probably is the better solution,... This one probably is the better solution, applying the force to the centroid of the mass of fluid in tank. Can you help me to create a simple UDF with the DEFINE_SOURCE macro? For example, I want...

Forum: FLUENT October 31, 2014, 09:55

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Thanks ghost82, now I have understood! I'll try... Thanks ghost82, now I have understood! I'll try this type of solution :) I wanna ask you another question: is it possible to load udf for sloshing problems (as this one) without using dynamic mesh?...

Forum: FLUENT October 30, 2014, 14:52

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 other captures... other captures...

Forum: FLUENT October 30, 2014, 14:51

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 To precise, I'm modelling a tank completely... To precise, I'm modelling a tank completely closed (4 walls) with the water moving inside it, so there isn't external water to the tank. In attachments I have posted the images of all info regarding...

Forum: FLUENT October 30, 2014, 13:50

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 I'm trying but there is something strange,... I'm trying but there is something strange, because when I click Display Zone Motion, I can view that the tank moves as imposed by udf (for any time step setted), but when I click Preview Mesh Motion,...

Forum: FLUENT October 30, 2014, 13:13

Replies: 56 Sloshing of water tank Views: 9,364 Posted By darkluix88 Thanks for the help! In any case, I'm trying to... Thanks for the help! In any case, I'm trying to continue to use the dynamic mesh but when I run calculation, after about 250 steps, it returns me this error: Error: Update-Dynamic-Mesh failed....

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