fame engine

yousefzadeh · March 14, 2014, 14:18

hi dears
I made a moving mesh from 0 deg to 180 deg in FAME ENGINE, but the mesh in 180 degree has the same number of mesh in 0 degree & the number of mesh didn't change during moving.. how can i solve this problem & have a different number of mesh during arbitury time steps???

tnx....

shahrbanoo · April 7, 2014, 15:09

Hi
Dear Ali Yousefzadeh

I think you have to make sure that all of the crank angles are meshed. Did you check stages of moving mesh? I mean if there is a mesh after you loaded a stage, it means that you made it...

yousefzadeh · April 7, 2014, 15:49

Dear shahrbano
i have a moving mesh that it has the same number of cells in every time step & i can't solve it!when it moves then i have a mesh in every timestep

shahrbanoo · May 29, 2014, 13:55

Hi dears
I made a moving mesh in fame engine. It starts from TDC wich is 0 deg. I has 5 rows at TDC. and it sweeps 90 deg with the rows being streched. and then when it reaches 90 deg the rows become 10. I want to know that is it a good mesh for running a case on it?
I made my moving meshes with fame engine plus, and there, in every step one row appended to the other rows. for this reason I can't accept that stretching a mesh will give a good result!

Mack · June 2, 2014, 14:28

Hi shahrbanoo,

You should define a maximum cell size (e.g. 1mm) and then the meshing algorithm will stretch the grid up to this limit. Every time this value is reached, a new layer is added.
For a good CFD study you should carry out a mesh independence study, which will show the best compromise between computational effort and accuracy. As a rule of thumb for ICE you can start with a maximum cell size of 1.5 and see the results.
Furthermore, take care with the meshing interval in the FEP panel. 10CAD for both create/move time-step is a good starting point, otherwise your mesh will become huge and/or show many negative volumes due to excessive stretching.

Regards,
Mack

March 14, 2014, 14:18	fame engine	#1
yousefzadeh New Member ali Join Date: Aug 2013 Posts: 15 Rep Power: 12	hi dears I made a moving mesh from 0 deg to 180 deg in FAME ENGINE, but the mesh in 180 degree has the same number of mesh in 0 degree & the number of mesh didn't change during moving.. how can i solve this problem & have a different number of mesh during arbitury time steps??? tnx.... shahrbanoo likes this.

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April 7, 2014, 15:09		#2
shahrbanoo Member shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 13	Hi Dear Ali Yousefzadeh I think you have to make sure that all of the crank angles are meshed. Did you check stages of moving mesh? I mean if there is a mesh after you loaded a stage, it means that you made it...

April 7, 2014, 15:49		#3
yousefzadeh New Member ali Join Date: Aug 2013 Posts: 15 Rep Power: 12	Dear shahrbano i have a moving mesh that it has the same number of cells in every time step & i can't solve it!when it moves then i have a mesh in every timestep

May 29, 2014, 13:55		#4
shahrbanoo Member shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 13	Hi dears I made a moving mesh in fame engine. It starts from TDC wich is 0 deg. I has 5 rows at TDC. and it sweeps 90 deg with the rows being streched. and then when it reaches 90 deg the rows become 10. I want to know that is it a good mesh for running a case on it? I made my moving meshes with fame engine plus, and there, in every step one row appended to the other rows. for this reason I can't accept that stretching a mesh will give a good result!

June 2, 2014, 14:28		#5
Mack New Member Mack Join Date: Aug 2013 Location: UK Posts: 16 Rep Power: 12	Hi shahrbanoo, You should define a maximum cell size (e.g. 1mm) and then the meshing algorithm will stretch the grid up to this limit. Every time this value is reached, a new layer is added. For a good CFD study you should carry out a mesh independence study, which will show the best compromise between computational effort and accuracy. As a rule of thumb for ICE you can start with a maximum cell size of 1.5 and see the results. Furthermore, take care with the meshing interval in the FEP panel. 10CAD for both create/move time-step is a good starting point, otherwise your mesh will become huge and/or show many negative volumes due to excessive stretching. Regards, Mack