FLUID BLOB TRACKING FOR EVALUATION OF MULTIPHASE FLOW SIMULATIONS
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for fluid blob tracking. One of the methods includes identifying, by a computer system, a connected fluid phase region in a flow simulation. The method includes tracking, by the computer system, the connected fluid phase region over a first timeframe and a second timeframe. The method also includes determining, by the computer system, movement of the connected fluid phase region from the first timeframe to the second timeframe based on the tracking.
1 - 30 . (canceled)
31 . A method for flow analysis executed on a data processing system, the method comprising:
identifying, by the data processing system, a fluid blob represented in fluid flow data; and
analyzing, by the data processing system the fluid flow data to identify one or more cells that indicate movement of the fluid blob from a first time to a second, subsequent time.
32 . The method of claim 31 wherein the flow analysis is a flow simulation and the fluid flow data are a representation of the fluid blob in the fluid simulation.
33 . The method of claim 31 wherein the flow analysis is of a physical flow and the fluid flow data are a representation of the fluid blob in the physical flow.
34 . The method of claim 31 , further comprising:
identifying phases in the fluid blob.
35 . The method of claim 34 wherein the cells are in the fluid blob, and identifying phases further comprises:
determining phases of the one or more cells in the fluid blob.
36 . The method of claim 35 wherein identifying phases further comprises:
determining phases in the one or more cells in the fluid blob by calculating the Atwood number of at least some of the one or more cells according to:
A =(ρ_1−ρ_2)/(ρ_1+ρ_2)
where, A is the Atwood number, ρ_1 is the density of phase 1, ρ_2 is the density of phase 2, with the determining Atwood number of the one or more cells compared to a threshold value, with the Atwood number for a given one of the one or more cells being above the threshold, qualifying the cell as belonging to a first phase, otherwise the cell is qualified as belonging to a second, different phase.
37 . The method of claim 35 wherein identifying phases further comprises:
determining one or more phases in the one or more cells in the fluid blob; and
storing a determined one of the one or more phases for the corresponding one or more cells in a state matrix.
38 . The method of claim 37 wherein the state matrix stores for each of the one or more cells corresponding one or more values that identify the phase calculated for the corresponding cell.
39 . The method of claim 37 , further comprising:
iteratively traversing the state matrix to determine cells that qualify as being of a first phase of the determined one or more phases; and
producing a listing of cells belonging to the first phase.
40 . The method of claim 39 , further comprising:
executing a filling algorithm to produce a list of the first phase cells that are connected to an initial one of the first phase cells, by using a six point nearest-neighbor stencil to examine each cell enclosing a current one of the first phase cells; and
adding the current one of the first phase cells to the list of first phase cells, when the current one of the first phase cells has a state matrix value that qualifies the current one of the first phase cells as being part of the first phase; and
continuing executing the filling algorithm until the list is exhausted, to find all connected cells of the fluid blob.
41 . The method of claim 40 wherein the fluid blob is in a domain, and the method further comprises:
finding fluid blobs in the domain; and
determining for each blob in the domain one or more of corresponding total volume, center of gravity location and one or more subdomains occupied by the blob.
42 . The method of claim 41 wherein finding the fluid blobs in the domain further comprises:
executing the filling algorithm for a given blob in the domain; and
continuing executing the filling algorithm until a complete set of blobs is established to find all blobs of the domain.
43 . A non-transitory computer storage medium encoded with computer program instructions that when executed by one or more computers cause the one or more computers to:
identify a fluid blob represented in fluid flow data; and
analyze the fluid flow data to identify one or more cells that indicate movement of the fluid blob from a first time to a second, subsequent time.
44 . The computer storage medium of claim 43 wherein the flow analysis is a flow simulation and the fluid flow data are a representation of the fluid blob in the fluid simulation.
45 . The computer storage medium of claim 43 wherein the flow analysis is of a physical flow and the fluid flow data are a representation of the fluid blob in the physical flow.
46 . The computer storage medium of claim 43 , further comprising:
identifying phases in the fluid blob.
47 . The computer storage medium of claim 46 wherein the cells are in the fluid blob, and identifying phases further comprises:
determining phases of the one or more cells in the fluid blob.
48 . The computer storage medium of claim 47 wherein identifying phases further comprises:
determining phases in the one or more cells in the fluid blob by calculating the Atwood number of at least some of the one or more cells according to:
A =(ρ_1−ρ_2)/(ρ_1+ρ_2)
where, A is the Atwood number, ρ_1 is the density of phase 1, ρ_2 is the density of phase 2, with the determining Atwood number of the one or more cells compared to a threshold value, with the Atwood number for a given one of the one or more cells being above the threshold, qualifying the cell as belonging to a first phase, otherwise the cell is qualified as belonging to a second, different phase.
49 . The computer storage medium of claim 47 wherein identifying phases further comprises:
determining one or more phases in the one or more cells in the fluid blob; and
storing a determined one of the one or more phases for the corresponding one or more cells in a state matrix.
50 . The computer storage medium of claim 49 wherein the state matrix stores for each of the one or more cells corresponding one or more values that identify the phase calculated for the corresponding cell.
51 . The computer storage medium of claim 49 , further comprising:
iteratively traversing the state matrix to determine cells that qualify as being of a first phase of the determined one or more phases; and
producing a listing of cells belonging to the first phase.
52 . The computer storage medium of claim 51 , further comprising:
executing a filling algorithm to produce a list of the first phase cells that are connected to an initial one of the first phase cells, by using a six point nearest-neighbor stencil to examine each cell enclosing a current one of the first phase cells; and
adding the current one of the first phase cells to the list of first phase cells, when the current one of the first phase cells has a state matrix value that qualifies the current one of the first phase cells as being part of the first phase; and
continuing executing the filling algorithm until the list is exhausted, to find all connected cells of the fluid blob.
53 . The computer storage medium of claim 52 wherein the fluid blob is in a domain, and the computer storage medium further comprises instructions to:
find fluid blobs in the domain; and
determine for each blob in the domain one or more of corresponding total volume, center of gravity location and one or more subdomains occupied by the blob.
54 . The computer storage medium of claim 53 wherein the instructions to find the fluid blobs in the domain further comprises instructions to:
execute the filling algorithm for a given blob in the domain; and
continue to execute the filling algorithm until a complete set of blobs is established to find all blobs of the domain.
55 . A system comprising:
one or more processor devices;
memory operatively coupled to the one or more processor devices;
a computer storage device storing computer program instructions that when executed by the one or more processor devices cause the system to:
identify a fluid blob represented in fluid flow data; and
analyze the fluid flow data to identify one or more cells that indicate movement of the fluid blob from a first time to a second, subsequent time.
56 . The system of claim 55 wherein the flow analysis is a flow simulation and the fluid flow data are a representation of the fluid blob in the fluid simulation.
57 . The system of claim 55 wherein the flow analysis is of a physical flow and the fluid flow data are a representation of the fluid blob in the physical flow.
58 . The system of claim 55 , further configured to:
identify phases in the fluid blob.
59 . The system of claim 58 wherein the cells are in the fluid blob, and instructions to identify phases further comprises instructions to:
determine phases of the one or more cells in the fluid blob.
60 . The system of claim 58 wherein instructions to identify phases further comprises instructions to:
determine phases in the one or more cells in the fluid blob by calculating the Atwood number of at least some of the one or more cells according to:
A =(ρ_1−ρ_2)/(ρ_1+ρ_2)
where, A is the Atwood number, ρ_1 is the density of phase 1, ρ_2 is the density of phase 2, with the determining Atwood number of the one or more cells compared to a threshold value, with the Atwood number for a given one of the one or more cells being above the threshold, qualifying the cell as belonging to a first phase, otherwise the cell is qualified as belonging to a second, different phase.
61 . The system of claim 58 wherein instructions to identify phases further comprises instructions to:
determine one or more phases in the one or more cells in the fluid blob; and
store a determined one of the one or more phases for the corresponding one or more cells in a state matrix.
62 . The system of claim 61 wherein the state matrix stores for each of the one or more cells corresponding one or more values that identify the phase calculated for the corresponding cell.
63 . The system of claim 61 , further comprising instructions to:
iteratively traverse the state matrix to determine cells that qualify as being of a first phase of the determined one or more phases; and
produce a listing of cells belonging to the first phase.
64 . The system of claim 63 , further comprising instructions to:
execute a filling algorithm to produce a list of the first phase cells that are connected to an initial one of the first phase cells, by using a six point nearest-neighbor stencil to examine each cell enclosing a current one of the first phase cells; and
add the current one of the first phase cells to the list of first phase cells, when the current one of the first phase cells has a state matrix value that qualifies the current one of the first phase cells as being part of the first phase; and
continue to execute the filling algorithm until the list is exhausted, to find all connected cells of the fluid blob.
65 . The system of claim 64 wherein the fluid blob is in a domain, and the system further comprises instructions to:
find fluid blobs in the domain; and
determine for each blob in the domain one or more of corresponding total volume, center of gravity location and one or more subdomains occupied by the blob.
66 . The system of claim 65 wherein finding the fluid blobs in the domain further comprises:
execute the filling algorithm for a given blob in the domain; and
continue executing the filling algorithm until a complete set of blobs is established to find all blobs of the domain.