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Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: jiejie

Forum: OpenFOAM May 10, 2010, 03:01

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie One quick question: if I need to do an inner... One quick question: if I need to do an inner product of a tensor "T" and a vector "a", should it be "T & a" instead of "a & T"?

Forum: OpenFOAM April 27, 2010, 01:39

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie figuring out how to update gradU. Thanks for... figuring out how to update gradU. Thanks for your time JunWei

Forum: OpenFOAM April 22, 2010, 20:27

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei I am still looking at how to... Hi JunWei I am still looking at how to update the gradU for each of the particle and I came across couple question as follows: 1. if gradU has 1301{(0 0 0 0 0 0 0 0 0 0)} at each time step, it...

Forum: OpenFOAM April 21, 2010, 01:19

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei I have attached my... Hi JunWei I have attached my solidparticleIO.C here. It looks like it counts the number of particles in the gradU in lagrangian folder, but all the gradU for each particle is not there.

Forum: OpenFOAM April 20, 2010, 23:49

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei Sorry about the confusion. I tried... Hi JunWei Sorry about the confusion. I tried to store the gradU at particle centers into the Lagrangian folder, but it only contains the fist particle. I added the following lines in the...

Forum: OpenFOAM April 20, 2010, 19:50

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei I updated gradU every time step as... Hi JunWei I updated gradU every time step as I have gradU in the data set for each time step. However, the there is no gradU stored in the lagrangian folder. As I have the position data and gradU...

Forum: OpenFOAM April 20, 2010, 01:49

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei Now I am trying to write out the... Hi JunWei Now I am trying to write out the gradU for each particle. So I add "gradU.write();" in the "solidparticleIO.C". This should create a file at /xxx/lagrangian/defaultCloud/gradU where xxx...

Forum: OpenFOAM April 10, 2010, 00:34

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Thanks JunWei I will give the lookup it... Thanks JunWei I will give the lookup it through ObjectRegistry a try.

Forum: OpenFOAM April 8, 2010, 22:44

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei I managed to get gradU calculated... Hi JunWei I managed to get gradU calculated and updated during the simulation. However, I have problem to access gradU. All my particle dynamics is defined in a file called "mySolidParticle.C". It...

Forum: OpenFOAM April 7, 2010, 00:40

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie That means at each point of the tensor field of... That means at each point of the tensor field of GradU, it should have 9 velocity gradient components as GradU.xx(), GradU.xy(), GradU.xz() ...?

Forum: OpenFOAM April 6, 2010, 23:55

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei I am trying to calculate the drag... Hi JunWei I am trying to calculate the drag and lift force acting on the particle so that I need the velocity gradients from the Eulerian field at the position of the particle. I will try to...

Forum: OpenFOAM April 6, 2010, 22:00

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Hi JunWei I am sorry about the confusion... Hi JunWei I am sorry about the confusion caused, the "U_" is the parcel velocity and it is a vector but not a vector field. Hence, I got some error complaining about "volTensorField...

Forum: OpenFOAM April 1, 2010, 21:33

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie Yes I am trying to get the gradient for Euler... Yes I am trying to get the gradient for Euler Field and use it to calculate the particle movement. Do you have any idea how to calculate the Euler field gradient?

Forum: OpenFOAM March 31, 2010, 19:28

Replies: 31 access to velocity gradient for Lagrangian particles Views: 9,769 Posted By jiejie access to velocity gradient for Lagrangian particles Dear all I am kind of get stuck at finding the velocity gradient at a particular position for the Lagrangian particle dynamics. My question is how I should calculate the velocity gradient if I...

Showing results 1 to 14 of 14

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