[gmx-users] umbrella sampling
Rose
rose.rhmn93 at gmail.com
Fri Feb 2 16:45:02 CET 2018
Sent from my iPhone
> On Feb 2, 2018, at 19:01, Justin Lemkul <jalemkul at vt.edu> wrote:
>
>
>
>> On 2/2/18 8:43 AM, rose rahmani wrote:
>> Hi, i'm doing umbrella sampling.(pulling AA toward nanosheet).and 4nS
>> simulation for each window.
>>
>>>> g_energy -f umbrella0.edr -o out.xvg
>> 1 Bond 2 Angle 3 Proper-Dih. 4
>> Improper-Dih.
>> 5 LJ-14 6 Coulomb-14 7 LJ-(SR) 8
>> Coulomb-(SR)
>> 9 Coul.-recip. 10 COM-Pull-En. 11 Potential 12
>> Kinetic-En.
>> 13 Total-Energy 14 Conserved-En. 15 Temperature 16 Pressure
>>
>> 17 Constr.-rmsd 18 Vir-XX 19 Vir-XY 20 Vir-XZ
>>
>> 21 Vir-YX 22 Vir-YY 23 Vir-YZ 24 Vir-ZX
>>
>> 25 Vir-ZY 26 Vir-ZZ 27 Pres-XX 28 Pres-XY
>>
>> 29 Pres-XZ 30 Pres-YX 31 Pres-YY 32 Pres-YZ
>>
>> 33 Pres-ZX 34 Pres-ZY 35 Pres-ZZ 36
>> #Surf*SurfTen
>> 37 Mu-X 38 Mu-Y
>>
>> 39 Mu-Z 40 Coul-SR:SOL-SOL
>>
>> 41 LJ-SR:SOL-SOL 42 Coul-14:SOL-SOL
>>
>> 43 LJ-14:SOL-SOL 44 Coul-SR:SOL-WAL
>>
>> 45 LJ-SR:SOL-WAL 46 Coul-14:SOL-WAL
>>
>> 47 LJ-14:SOL-WAL 48 Coul-SR:SOL-ZnS
>>
>> 49 LJ-SR:SOL-ZnS 50 Coul-14:SOL-ZnS
>>
>> 51 LJ-14:SOL-ZnS 52 Coul-SR:SOL-Protein
>>
>> 53 LJ-SR:SOL-Protein 54 Coul-14:SOL-Protein
>>
>> 55 LJ-14:SOL-Protein 56 Coul-SR:SOL-NA
>>
>> 57 LJ-SR:SOL-NA 58 Coul-14:SOL-NA 59 LJ-14:SOL-NA 60
>> Coul-SR:SOL-CL
>> 61 LJ-SR:SOL-CL 62 Coul-14:SOL-CL
>>
>> 63 LJ-14:SOL-CL 64 Coul-SR:SOL-wall0
>>
>> 65 LJ-SR:SOL-wall0 66 Coul-14:SOL-wall0
>>
>> 67 LJ-14:SOL-wall0 68 Coul-SR:SOL-wall1
>>
>> 69 LJ-SR:SOL-wall1 70 Coul-14:SOL-wall1
>>
>> 71 LJ-14:SOL-wall1 72 Coul-SR:WAL-WAL
>>
>> 73 LJ-SR:WAL-WAL 74 Coul-14:WAL-WAL
>>
>> 75 LJ-14:WAL-WAL 76 Coul-SR:WAL-ZnS
>>
>> 77 LJ-SR:WAL-ZnS 78 Coul-14:WAL-ZnS
>>
>> 79 LJ-14:WAL-ZnS 80 Coul-SR:WAL-Protein
>>
>> 81 LJ-SR:WAL-Protein 82 Coul-14:WAL-Protein
>>
>> 83 LJ-14:WAL-Protein 84 Coul-SR:WAL-NA
>>
>> 85 LJ-SR:WAL-NA 86 Coul-14:WAL-NA 87 LJ-14:WAL-NA 88
>> Coul-SR:WAL-CL
>> 89 LJ-SR:WAL-CL 90 Coul-14:WAL-CL
>>
>> 91 LJ-14:WAL-CL 92 Coul-SR:WAL-wall0
>>
>> 93 LJ-SR:WAL-wall0 94 Coul-14:WAL-wall0
>>
>> 95 LJ-14:WAL-wall0 96 Coul-SR:WAL-wall1
>>
>> 97 LJ-SR:WAL-wall1 98 Coul-14:WAL-wall1
>>
>> 99 LJ-14:WAL-wall1 100 Coul-SR:ZnS-ZnS
>>
>> 101 LJ-SR:ZnS-ZnS 102 Coul-14:ZnS-ZnS
>>
>> 103 LJ-14:ZnS-ZnS 104 Coul-SR:ZnS-Protein
>>
>> 105 LJ-SR:ZnS-Protein 106 Coul-14:ZnS-Protein
>>
>> 107 LJ-14:ZnS-Protein 108 Coul-SR:ZnS-NA
>>
>> 109 LJ-SR:ZnS-NA 110 Coul-14:ZnS-NA 111 LJ-14:ZnS-NA 112
>> Coul-SR:ZnS-CL
>> 113 LJ-SR:ZnS-CL 114 Coul-14:ZnS-CL
>>
>> 115 LJ-14:ZnS-CL 116 Coul-SR:ZnS-wall0
>>
>> 117 LJ-SR:ZnS-wall0 118 Coul-14:ZnS-wall0
>>
>> 119 LJ-14:ZnS-wall0 120 Coul-SR:ZnS-wall1
>>
>> 121 LJ-SR:ZnS-wall1 122 Coul-14:ZnS-wall1
>>
>> 123 LJ-14:ZnS-wall1 124 Coul-SR:Protein-Protein
>>
>> 125 LJ-SR:Protein-Protein 126 Coul-14:Protein-Protein
>>
>> 127 LJ-14:Protein-Protein 128 Coul-SR:Protein-NA
>>
>> 129 LJ-SR:Protein-NA 130 Coul-14:Protein-NA
>>
>> 131 LJ-14:Protein-NA 132 Coul-SR:Protein-CL
>>
>> 133 LJ-SR:Protein-CL 134 Coul-14:Protein-CL
>>
>> 135 LJ-14:Protein-CL 136 Coul-SR:Protein-wall0
>>
>> 137 LJ-SR:Protein-wall0 138 Coul-14:Protein-wall0
>>
>> 139 LJ-14:Protein-wall0 140 Coul-SR:Protein-wall1
>>
>> 141 LJ-SR:Protein-wall1 142 Coul-14:Protein-wall1
>>
>> 143 LJ-14:Protein-wall1 144 Coul-SR:NA-NA
>>
>> 145 LJ-SR:NA-NA 146 Coul-14:NA-NA 147 LJ-14:NA-NA 148
>> Coul-SR:NA-CL
>> 149 LJ-SR:NA-CL 150 Coul-14:NA-CL
>>
>> 151 LJ-14:NA-CL 152 Coul-SR:NA-wall0
>>
>> 153 LJ-SR:NA-wall0 154 Coul-14:NA-wall0
>>
>> 155 LJ-14:NA-wall0 156 Coul-SR:NA-wall1
>>
>> 157 LJ-SR:NA-wall1 158 Coul-14:NA-wall1
>>
>> 159 LJ-14:NA-wall1 160 Coul-SR:CL-CL 161 LJ-SR:CL-CL 162
>> Coul-14:CL-CL
>> 163 LJ-14:CL-CL 164 Coul-SR:CL-wall0
>>
>> 165 LJ-SR:CL-wall0 166 Coul-14:CL-wall0
>>
>> 167 LJ-14:CL-wall0 168 Coul-SR:CL-wall1
>>
>> 169 LJ-SR:CL-wall1 170 Coul-14:CL-wall1
>>
>> 171 LJ-14:CL-wall1 172 Coul-SR:wall0-wall0
>>
>> 173 LJ-SR:wall0-wall0 174 Coul-14:wall0-wall0
>>
>> 175 LJ-14:wall0-wall0 176 Coul-SR:wall0-wall1
>>
>> 177 LJ-SR:wall0-wall1 178 Coul-14:wall0-wall1
>>
>> 179 LJ-14:wall0-wall1 180 Coul-SR:wall1-wall1
>>
>> 181 LJ-SR:wall1-wall1 182 Coul-14:wall1-wall1
>>
>> 183 LJ-14:wall1-wall1 184 T-System
>>
>> 185 Lamb-System
>>
>> how can i understand that this 4nS simulation is enough for all 30 windows
>> which i selected after pulling? as you see i'm doing NVT.i tried to
>> calculate temperature(15) and total energy(13) and potential(11) for
>> example for first window;
>> Energy Average Err.Est. RMSD Tot-Drift
>> ------------------------------------------------------------
>> -------------------
>> Potential -72708 9.2 227.038 -38.8081
>> (kJ/mol)
>> Total Energy -63763.9 8.7 273.747 -34.9771
>> (kJ/mol)
>> Temperature 299.977 0.022 5.04346 0.128492 (K)
>> plots show that temperature is ok and total energy doesn't have
>> considerable fluctuation (except after first moment). but potential
>
> None of those values tell you anything about the convergence of your simulations.
>
>> fluctuates. since i don't see sharp peaks in PMF (but good trends), is it
>> rational to do long time simulation? what is the main clue for knowing
>> that? is it potential?
>
> If you want to know if the PMF has converged, calculate it for consecutive, non-overlapping time periods. If they are statistically indistinguishable, you are done. If they are still changing over time, you need longer runs.
You mean i should use the output Of 4nS simulation, as an input for,for example next 10nS and at the end i have simulated it for 14nS,yes?
What do you mean "statistically", would you please give me an example?
Thank you so much
>> and what exactly total energy(13) refers to in my system?
>
> Total energy = kinetic energy + potential energy. This is a basic thermodynamic definition.
>
> -Justin
>
> --
> ==================================================
>
> Justin A. Lemkul, Ph.D.
> Assistant Professor
> Virginia Tech Department of Biochemistry
>
> 303 Engel Hall
> 340 West Campus Dr.
> Blacksburg, VA 24061
>
> jalemkul at vt.edu | (540) 231-3129
> http://www.biochem.vt.edu/people/faculty/JustinLemkul.html
>
> ==================================================
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